WELL, if zanz does add these to the game, He probably will balance them, probably taking the idea of secondary weapons and not really using the weapons, i guess
and no, the secondary weapon will overlap the primary weapon (so deflag/steal destroys or steals both) the integer of dmg is random between 1-5 for unupped.
Also, the idea of Chaos BallS (see the S) is that it hits multiple targets.
Heres a table, kinda.
1 use of unupped has a 60% per creature to target your own, and 40% to target your opponents. So in average on a bad day, 2 creatures of yours would get targeted, maybe 3, and you know the rest.