An exception to the "no-electric-guitar" rule might be electric guitars fitted with piezo pickups (notably Parker Fly, but modified bridges are available for Strat and Tele, and other instruments). Some woman at Cambridge last year was using a Parker Fly played finger-style, and you wouldn't have easily been able to tell (given the quality of sound from big PA systems) that it wasn't an twangy acoustic with good sustain.

Steve-o, the electric guitar itself is "soft, soft, soft". The only thing that makes it loud is the amp/PA, which makes it inherently identical to any other guitar in a club with a PA, no?

Graham.