My two cents:
Electro-Mechanical
- EM Hangout - to discuss games, features, price checks, the ongoing and useless 23,435 post threads etc.
- Tech - For tech issues related to pinball and any EM arcade games
- Arcade - Shooters, bowlers, roll-downs, etc.
Or...really, dump it all into one, including Tech. I really would prefer that, actually.