i. can i do this:

scriptname v18combatsimulationshort buttonbegin onactivateshowmessage v18combatsimmenuv18comsimroom01.lock 100set button to getbuttonpressedif ( button == 0);spawn raiderv18combatsimoppmarker.placeatme Raider2GunAM 1 3endifend

That will not work.

OnActivate only runs once. You need to use a GameMode block to capture a button press.

http://geck.gamesas.com/index.php/GetButtonPressed

ok. but will it display the raider at the xmarkerheading

No because you will not be able to capture the button press in an OnActivate block of code.

Put it in a GameMode block and it will place a raider at your specified Reference ID.