KotOR does have the capability for new modules - surely you've seen the Coruscant Jedi Temple on KotORFiles?
I would also refer you to Ms Forge's excellent Recruitable Kay mod, which removes Juhani from the game and introduces a new character, Kay, with her own completely original sidequest system. It's Inyri's biggest mod, period, and certainly among the most elaborate I've seen for KotOR.
KotOR does have the capability for new modules - surely you've seen the Coruscant Jedi Temple on KotORFiles?
I believe that 'module' is unused game-packaged assets (probably the module used in that one cutscene) so it's not a 'new module'. Making custom modules was not possible at the time that mod was released. However it is now (see the Temple Beta by Quanon).
On the mod side, though, JA simply can't compare to newer engines like UE3 and CryEngine 2.
Hell, you could probably rebuild JA as a UT3 mod, and it'd be far superior on all counts, not just power and graphics. Would be far easier to build a full game on UT3 than it would to make even a few SP missions on JA, too, so like hell the mod community wouldn't want to transition.
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