diff --git a/CREDITS.md b/CREDITS.md
index f3b359298d..df7d63d42e 100644
--- a/CREDITS.md
+++ b/CREDITS.md
@@ -766,6 +766,7 @@ This page lists all the individual contributions to the project by their author.
   - Country-specific veteran buildings
   - Fix the Spotlight-transport interaction bug caused by the incorrect reference removal fix
   - Fix the issue that *Customizable crew type per country* not considering parsing order caused game parsing failure and a warning in the log
+  - Customize `IdleActionFrequency`
 - **Ollerus**:
   - Build limit group enhancement
   - Customizable rocker amplitude
diff --git a/docs/Fixed-or-Improved-Logics.md b/docs/Fixed-or-Improved-Logics.md
index 6452652d71..1bcd4cff12 100644
--- a/docs/Fixed-or-Improved-Logics.md
+++ b/docs/Fixed-or-Improved-Logics.md
@@ -2748,6 +2748,18 @@ In `rulesmd.ini`:
 HarvesterLoadRate=                    ; integer, default to [General] -> HarvesterLoadRate
 ```
 
+### Customize `IdleActionFrequency`
+
+- Now `IdleActionFrequency` can be customized on each infantry.
+  - With a single value, the interval is a random value between `IdleActionFrequency * 450` and `IdleActionFrequency * 1800` frames, which customizes the frequency the same way the global value does.
+  - With two values, the first one directly sets the lower bound and the second one the upper bound of the random interval in frames.
+
+In `rulesmd.ini`:
+```ini
+[SOMEINFANTRY]                        ; InfantryType
+IdleActionFrequency=                  ; a single floating point value, or a pair of integers defining the random delay range in frames (min, max), defaults to [AudioVisual] -> IdleActionFrequency
+```
+
 ### Customize type selection for IFV
 
 - In vanilla game, when using type selection command on IFVs, all of them will be selected regardless of their current modes, which is allowed to customize now.
diff --git a/docs/Whats-New.md b/docs/Whats-New.md
index 2cf117e54f..26f8dad015 100644
--- a/docs/Whats-New.md
+++ b/docs/Whats-New.md
@@ -444,6 +444,7 @@ HideShakeEffects=false           ; boolean
 - Country-based attached effects (by Ollerus)
 - [Customizable crew type per country](Fixed-or-Improved-Logics.md#customizable-crew-type-per-country) (by Sovietianqi, FlyStar, Noble_Fish)
 - [Country-specific veteran buildings](Fixed-or-Improved-Logics.md#country-specific-veteran-buildings) (by Noble_Fish)
+- [Customize `IdleActionFrequency`](Fixed-or-Improved-Logics.md#customize-idleactionfrequency) (by Noble_Fish)
 
 #### Vanilla fixes:
 - Fixed the bug where a building with `Factory=BuildingType` owned by the AI did not play `ProductionAnim` when placing a produced building (by Noble_Fish)
diff --git a/src/Ext/Infantry/Hooks.cpp b/src/Ext/Infantry/Hooks.cpp
index 1f20e685fd..1fadf04dda 100644
--- a/src/Ext/Infantry/Hooks.cpp
+++ b/src/Ext/Infantry/Hooks.cpp
@@ -275,3 +275,34 @@ DEFINE_HOOK(0x51DA44, InfantryClass_DoAction_SequenceRate_Store, 0x6)
 }
 
 #pragma endregion
+
+DEFINE_HOOK_AGAIN(0x51CDD9, InfantryClass_UpdateIdleAction_IdleActionFrequency, 0x6)
+DEFINE_HOOK(0x51CDEF, InfantryClass_UpdateIdleAction_IdleActionFrequency, 0x6)
+{
+	GET(InfantryClass* const, pThis, ESI);
+	auto const pTypeExt = InfantryTypeExt::Fetch(pThis->Type);
+
+	if (auto const pRange = pTypeExt->IdleActionFrequency.GetEx())
+	{
+		const bool isUpperBound = R->Origin() == 0x51CDD9;
+		double value;
+
+		if (pRange->ValueCount >= 2)
+		{
+			// Two values set the delay range directly in frames,
+			const double lower = std::min(pRange->X, pRange->Y);
+			const double upper = std::max(pRange->X, pRange->Y);
+			value = isUpperBound ? upper / 1800.0 : lower / 450.0;
+		}
+		else
+		{
+			value = pRange->X;
+		}
+
+		__asm { fld value }
+
+		return R->Origin() + 0x6;
+	}
+
+	return 0;
+}
diff --git a/src/Ext/InfantryType/Body.cpp b/src/Ext/InfantryType/Body.cpp
index 83a25474cf..384c54d999 100644
--- a/src/Ext/InfantryType/Body.cpp
+++ b/src/Ext/InfantryType/Body.cpp
@@ -53,6 +53,7 @@ void InfantryTypeExt::LoadFromINIFile(CCINIClass* const pINI)
 		if (exArtINI.ReadBool(pRateSection, key, &normalized))
 			this->CustomSequenceNormalized[i] = normalized ? 1 : 0;
 	}
+	this->IdleActionFrequency.Read(exINI, pSection, "IdleActionFrequency");
 }
 
 template <typename T>
@@ -77,6 +78,7 @@ void InfantryTypeExt::Serialize(T& Stm)
 		.Process(this->InfantryAutoDeploy)
 		.Process(this->CustomSequenceRates)
 		.Process(this->CustomSequenceNormalized)
+		.Process(this->IdleActionFrequency)
 		;
 }
 
diff --git a/src/Ext/InfantryType/Body.h b/src/Ext/InfantryType/Body.h
index e2ebeb14b7..2d32ec8120 100644
--- a/src/Ext/InfantryType/Body.h
+++ b/src/Ext/InfantryType/Body.h
@@ -27,6 +27,7 @@ class InfantryTypeExt final : public TechnoTypeExt
 	std::vector<std::vector<CoordStruct>> DeployedWeaponBurstFLHs;
 	std::vector<std::vector<CoordStruct>> EliteDeployedWeaponBurstFLHs;
 	Nullable<bool> InfantryAutoDeploy;
+	Nullable<PartialVector2D<double>> IdleActionFrequency;
 
 	// Per-sequence animation rates read from the infantry's art section
 	std::vector<int> CustomSequenceRates;
@@ -49,6 +50,7 @@ class InfantryTypeExt final : public TechnoTypeExt
 		, InfantryAutoDeploy {}
 		, CustomSequenceRates(42, -1)
 		, CustomSequenceNormalized(42, -1)
+		, IdleActionFrequency {}
 	{ }
 
 	InfantryTypeClass* OwnerObject() const