[AaronKillz]

Код:

#define PRESSED(%0) \
	(((newkeys & (%0)) == (%0)) && ((oldkeys & (%0)) != (%0)))

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
	if (PRESSED(KEY_ACTION))
	{
           //do command stuff here
	}
	return 1;
}

https://sampwiki.blast.hk/wiki/OnPlayerKeyStateChange