I play a classical guitar for everything because that's the only guitar I have available at present. I own a solid-body electric guitar, which I don't have where I'm currently living and I originally learned on a steel-string.

A classical guitar just isn't that loud and I wouldn't make any special efforts to play loud if amplification isn't available. My inclination would be to use a guitar that's suited for the room. It's great if people have extraordinary skills, like filling a large concert hall with the sound of a classical guitar with no amplification, but I don't think I would try to practice this --- even if I had any idea how it was possible.

I sometimes play my guitar with a flat pick, just because I like the technique and I hope I may be able to buy other instruments in the future. I tried picking on my electric guitar using fingerpicks, but I found that the strings were uncomfortably close together for this purpose, and the sound was too muddy (it's a solid-body).

I've been thinking of buying fingerpicks and especially a thumb pick. I'm very used to picking with my fingers and thumb, but I'd like to practice for the case that I buy a steel-string (which I'd like to do) and I also think it might be more comfortable to pick with the thumb using a thumb pick. I don't know, I just want to test this.

I never fret strings with my thumb, even on the narrower neck of an electric guitar. I have medium-size hands, so it's not very practical on a classical guitar. I just don't like it and don't find it to be a useful technique for me. I only have done it when music specifically requires it. However, in the one case I recall (Dave van Ronk's piece in Happy Traum's _Fingerpicking Styles for Guitar_), I found it wasn't necessary and I could finger that passage or those passages another way.

I really like the increased room to manouever for the right hand, and one soon gets used to the slightly increased difficulty of fretting. Like all instruments, a classical guitar has its limitations. If I could only have one guitar to play (the situation at present), it would be a classical guitar. I play classical (in the wider sense) music, folk music, jazz and various kinds of popular music on mine.