Yes it is possible I think you're eith looking for this
http://forum.thegamecreators.com/?m=forum_view&t=73014&b=23
or
;Artificial Intelligence Script
;Header
desc = Plr In Zone and spawn enemy
;Triggers
:state=0,plrwithinzone=1:activateifused=1,state=1
;End of Script
use that as the main ai of a triggerzone and set the if used space to the enemies name
and set spawn at start to "no" and spawn after delay to true and if im not missing anything that should work
heres the code i use myself
;Artificial Intelligence Script
;Header
desc = Plr In Zone and spawn enemy
;Triggers
:state=0,plrwithinzone=1:activateallinzone=1,activateifused=1,state=1
;End of Script
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