@friendly:
If you want, I can do that for you. A converter is not available yet but I started one for v3arcade->ibProArcade in a lazy minute I had

but it's not finished and untested
@tcs:
Gameinstallation in ibProArcade is very simple, just upload the tar/zip-Archive to the corresponding /arcade folder and install using the AdminCP-Functions of ibProArcade

Nothing with Serveraccess or any automation (even on removal of games)...
@Harry72 & kewl1uk:
While there is a multiplayer-feature
planned for v3 this ibProArcade brings along its compatibility with PNflashgames, and there were some multiplayer-PNflashgames that could be played within ibProArcade. I saw this on a Betaversion of my ibPro at one of the testers site, and it was very impressive. But as a matter of fact the webmaster of PNflashgames is currently looking for a possibility to host those multiplayergames somewhere as his trafficcosts explode

So we may wait for him to represent those multiplayergames and use them in our Arcade's.
Please notice that PNflashgames are not for free, you have to buy a License and enter its Licensecode in ibProArcade. But it's worth