By all means, suggest away.
Basically anything that doesn't have a specific forum is discussed in the Martial Arts Talk forum, that would be the one to discuss "other" martial arts.
The reason certain arts get their own forum is because they are asked for, usually by a large number of people. Regarding the Kali request, if there is a large number of practitioners who ask for a FMA/Southeastern Asia Martial Arts then I believe it would be granted.
I hope I've helped some.