[trevius]

I am not sure if the IsEngaged() check works for players, but if so, I think this code might work for character OOC regen:

client_process.cpp

void Client::DoHPRegen() {
	if(GetHP() < GetMaxHP()) {  //Don't do HP regen if HPs are full
		int32 level=GetLevel();
		int32 oochpregen = 0;
		int8 oocwaittime = 0;
		sint32 normal_regen = LevelRegen();
		sint32 item_regen = itembonuses.HPRegen;
		sint32 spell_regen = spellbonuses.HPRegen;
		sint32 total_regen = normal_regen + item_regen + spell_regen;
		if(IsEngaged()) {
			oochpregen = 0;
			oocwaittime = 0;
		}
		if(IsCasting() && RuleB(Character, OOCRegenCastCheck)) {
			oochpregen = 0;
			oocwaittime = 0;
		} else {
			if(oocwaittime >= RuleI(Character, OOCRegenWaitTicks)) {
				oochpregen += GetMaxHP() * RuleI(Character, OOCHPRegen) / 100;
				oochpregen -= level / RuleI(Character, MaxLevel) * oochpregen * RuleI(Character, OOCRegenLevelScale) / 100;
			} else
				oocwaittime = oocwaittime++;
		}
		total_regen = ((total_regen * RuleI(Character, HPRegenMultiplier)) / 100) + oochpregen;
		SetHP(GetHP() + total_regen);
		SendHPUpdate();
	}
}

void Client::DoManaRegen() {
	if(GetMana() < GetMaxMana()) { //Don't do mana regen if mana is full
		int32 level=GetLevel();
		int32 regen = 0;
		int8 oocwaittime = 0;
		int32 oocmanaregen = 0;
		if(IsEngaged()) {
			oocmanaregen = 0;
			oocwaittime = 0;
		}
		if(IsCasting() && RuleB(Character, OOCRegenCastCheck)) {
			oocmanaregen = 0;
			oocwaittime = 0;
		} else {
			if(oocwaittime >= RuleI(Character, OOCRegenWaitTicks)) {
				oocwaittime = oocwaittime++;
				oocmanaregen += GetMaxMana() * RuleI(Character, OOCManaRegen) / 100;
				oocmanaregen -= level / RuleI(Character, MaxLevel) * oocmanaregen * RuleI(Character, OOCRegenLevelScale) / 100;
			} else
				oocwaittime = oocwaittime++;
		}
		if (IsSitting() ||(GetHorseId() != 0)) {		//this should be changed so we dont med while camping, etc...
			if(HasSkill(MEDITATE)) {
				medding = true;
				regen = (((GetSkill(MEDITATE)/10)+(level-(level/4)))/4)+4;
				regen += spellbonuses.ManaRegen + itembonuses.ManaRegen;
				CheckIncreaseSkill(MEDITATE, -10);
			}
			else
				regen = 2+spellbonuses.ManaRegen+itembonuses.ManaRegen+(level/5);
		}
		else {
			medding = false;
			regen = 2+spellbonuses.ManaRegen+itembonuses.ManaRegen+(level/5);
		}

		//AAs
		regen += GetAA(aaMentalClarity) + GetAA(aaBodyAndMindRejuvenation);

		regen = ((regen * RuleI(Character, ManaRegenMultiplier)) / 100) + oocmanaregen;
		
		SetMana(GetMana() + regen);
		SendManaUpdatePacket();
	}
}

ruletypes.h

RULE_INT ( Character, OOCHPRegen, 0) //Regens this % of HPs per tick if not engaged with a mob (Disabled = 0)
RULE_INT ( Character, OOCManaRegen, 0) //Regens this % of Mana per tick if not engaged with a mob (Disabled = 0)
RULE_INT ( Character, OOCRegenLevelScale, 0) //OOC Regen will scale down per level (0 = scaling disabled, 1 = least scaling, 100 = most)
RULE_INT ( Character, OOCRegenWaitTicks, 0) //OOC Regen will wait this many ticks after combat before starting Out of Combat Regen
RULE_BOOL ( Character, OOCRegenCastCheck, false) //OOC Regen will be stopped if player is casting and this rule is set to true

Note that setting OOCRegenLevelScale to 100 will make it so that a max level character will not get any OOC Regen bonus at all, but a level 1 will still get almost the full bonus and as they level up the bonus will get less and less.

Optional SQL

Insert into rule_values values (0, 'Character:OOCHPRegen', 0);
Insert into rule_values values (0, 'Character:OOCManaRegen', 0);
Insert into rule_values values (0, 'Character:OOCRegenLevelScale', 0);
Insert into rule_values values (0, 'Character:OOCRegenWaitTicks', 0);
Insert into rule_values values (0, 'Character:OOCRegenCastCheck', false);

I will try this out and post back on how this and the code AndMetal posted work if at all