Ehh.. As someone who likes to train with bots (bad connection on my end mostly) I have to say that Bots (esspecially engies) are way to easy to outplay, making that gamemode pretty one sided in my opinion.
Custom maps would be awesome
(Would suggest pl_rainy_badwater and ctf_konvoi there :P)
Also, having an EU server would be nice.
So.. that would basically be a different version of prob hunt?