Originally Posted By: Reconnoiter
maybe something with waiting before returning the value?

yes, that is the reason. You can't return a value when there is a wait inside the function. You might pass a pointer as parameter of the function.

Code:
function get_keyType(var* _keyType) {
	var _startTime = 0;
	while (mouse_left) {
		if (total_ticks - _startTime > 8) { // 8 ticks == 0.5 seconds
			*_keyType = KEYTYPE_HOLD;
			break;
		}
		wait(1);
	}
}
...
get_keyType(&_keyType);


Salud!