is there a program that will let me write new trigger cause/efects that are not inculded in sc
Nope. There's creative ways of using the current Triggers, depending on what you have in mind. I'm sure if you got some modding programs and started hacking, you sure could. That would require much work and not be compatible with B.net though, so its not worth it anyway.
how bout ai scripts? could u write those?
i've tried having an ai share vision with human players with the ai script that came with sc xtra editor but for whatever reasons it won't work, no matter how hard i try:'( i'm so discouraged:help:
You're probably doing it wrong. The Shared Vision AIs are inverted. You have to give the trigger to the player recieving the vision and use the Shared Vision AI for the player who is to be seen.
Yes, there are programs that let you write your own AI scripts. Still, you need a custom mod for that, which would make it only useful for single player Campaigns and such.
there might be a program out there (or not) thatll let you make/enhance your own scripts, but the programming involved to change something like that would probably be A LOT. just use the ones we have now to your best advantage.