Personally, I prefer using spaces.
"ulx <command>"
Personal preference ... I like it.
Technical preference ... it's quicker to hit the spacebar with my thumb, than Pinky shift and pinky underscore.
Also, one suggestion.. using "ulx help" in the console fills up much of it. Often, I remember a command beginning at the first of the alphabet, but I have to scroll back to see it for its parameters.
Being able to get the individual command help that is printed by each command when full list is seen, by typing "ulx help <command>" would be wonderful.
I'd suggest "ulx help <command>" over "ulx <command> help". I could see wanting to perform a command on someone with 'help' in thier nickname.
Perhaps also have the help line for the command printed if parameters passed to it aren't correct.
The generic 'not enough info' message printed now doesn't really help much.