Well i have not yet updated that two lists from 2.0 to 2.1 but the changes should not be that huge as it was just a bugfix release.
And no there is not really an other way to add bots beside bot_number. Its not possible to add a specific bot like in quake3 but its also not needed as the bots do not have different settings as in quake3. But you can use the variable minplayers instead of bot_number as its more flexible. It will only add or remove bots when there are less/more players then minplayers. Thats useful for team based servers.
No, for 2 reasons:
1) large parts of the bot system would need to be redone to add individual bot skills
2) more important: it would be really hard keep those individual settings on map changes