I'm pretty good with the railgun against bots but I am new to online play and have a lot of trouble with lag. I am slowly getting better.
I intend to play some PKarena. I used to do it a lot against the reaper in Q1 and now broardband has opened up so many new things I don't have the time to try them all yet. PK is second on my list after Gen.
You are right about the fragtown maps. the textures were photographs, so for my own personal use I changed a lot of them to make it look better. I still have them on my comp.
My favorite mods are always the ones that have the best bot support. My current top favorite mods are 1. Head Hunters, 2. Bazooka Quake, and 3. Generations.
Generations is #3 right now since it doesn't yet have all those nice options for bot matches I would like, and it's still in it's beta stage. As the coding, weapon animations, and botmatch options start to be finished, Generations will easily be my favorite mod
(especially if they add the option to choose a random map from your entire BaseQ3 folder *hint hint)