Yeah, taking a second gadgeteer won't really do much for you. RFS-81 is a much better choice (and the only NPC I pick up these days). There is only one place he won't go, and you'll need two slots in that location anyway.
As to changing Vi, if you want to dual maces, you're better off switching her to fighter for the berserk advantage. The only offhand mace I know of in the game is Diamond Eyes, a very good weapon. Even as a fighter, she can still cast her spells, though they will never improve from the time you change class.
On the other hand, if you're happy with her overall performance now, there's probably no need to switch at all.
Nightowl2
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