Can ULX prevent users from spawning with <whatever> weapon?

[JamminR]

Answer 1)
No. Not with ULX directly. It only provides a strip command which removes all weapons from an individual player.

Answer 2)
Aaron113 is working on a restriction suite called URS that will restrict entities, props, weapons, and more.
http://forums.ulyssesmod.net/index.php/topic,5269.0.html

Answer 3)
With Spbogie's UTeam, a community member named Kyzer wrote some modified code for it that some have used with success.
See this thread for the modification discussion.
(Hey, we never said all the answers were easy)

Answer 4)
If you want to limit spawn weapons totally, not caring what team/admin group players are a member of, see Spbogie's post
http://forums.ulyssesmod.net/index.php/topic,2940.msg8002.html#msg8002

Answer 5) - Support discontinued. Left here in case someone wishes to get inspiration from it.
Jay209015 has created a great release called Urestrict. (Now discontinued)
See http://forums.ulyssesmod.net/index.php/topic,3680.0.html

_{[Edit-Stickly Man!]- Updated post, added URS}

[MrPresident]

*edit* fixed one of your links JamminR.