...I think the 4-way version of the Leaf-Pro could be closer fit...
Thanks, that looks to be what I'm in the market for. Just a couple ?'s
1. Would I be able to comfortably bottom mount this under 3/4"?
The only sticks which one can mount "comfortably" in a 3/4" panel are going to be those with long shafts. Long shafts usually mean long throws, which many tend not to associate with a good 4-way. You would need to pocket out the underside to give you the length you want, unless you don't mind a short stick. The Pac-Man stick was pretty short, so you might be ok with it as is.
2. Can the ball top be changed (and if so what size/thread are we looking at)?
Not on these. The Leaf-Pros are currently red only.
3. If no to either 1 or 2, any other recommendations?
Not if the Leaf Pro is the kind of stick you are looking for. There are pretty limited choices in that type of stick, but I do have some of the Zippyy and sanwa-inspired sticks, including an below-panel-switchable design, which can be configured for 4-way operation and have white balls as options. But they play quite a bit differently. Shoot me an email if you want one before I manage to get them on the store.
RandyT