I've done some hunting and from what I can tell, the latest Splinter Cell game to have a map editor is Chaos Theory.
1) Will Conviction have a map editor?
2) Does Double Agent have a map editor?
3) How can I replace the Sam mesh with my own model for use in Custom Chaos theory maps?
I have an idea for a personal project that is not well suited for the editors I'm familiar with (Unreal 3, Crysis Sandbox), but some of the mechanics of Splinter Cell fit very well. Any help would be appreciated.