Sierra released a stand alone Mission Editor for SWAT 4 over the weekend, which allows you to make your own missions.
This file is actually part of the retail pack, but the release calls attention to the fact that yes, you can make your own missions.
While it's not a SDK for mods (maybe that will come), I'd hope that the tactically minded folks here can make at lease one SWAT4 map to uphold the
TG honor.
Get the kit here:
http://www.vugames.com/downloadfile....&mediaid=14275
Yeah, yeah Mateo, what does it look like!
That's a really good tool set.
Have fun!