First of all, congratulations on this amazing project. It was about time Dark Forces and its great engine got some much deserved love
What I'm currently missing the most from The Force Engine, is a "make the program portable" feature to make TFE save all data, settings and savegames in a subfolder inside the main install directory (instead of %USERPROFILE%\Documents\TheForceEngine and %PROGRAMDATA%\TheForceEngine)
If I may, I suggest this feature could be triggered when the user places an empty zero-byte file named portable or portable.txt in the main install directory. I've used some software that implement the optional portable feature this way, and I think it's a pretty convenient way to do it.
On another semi-related request:
Also would be nice if The Force Engine automatically detected and searched \dark\ and \outlaws\ subfolders inside the TFE install dir to look for these games content (it only autodetects if the .gob files and related subfolders such as lfd are directly in the main TheForceEngine.exe folder, which works, but it's not as elegant)