What you're saying about using bots for a server sounds reasonable. Not only will people who join not feel so alone, but anyone browsing the web for a good server will also be more willing to join if he sees that there are 4 players and not zero.
However, in this respect, PODBot leaves some room for improvement because there are some minor details other ppl already mentioned here:
1) The welcome messages on the screen ("Welcome to PODBot v2.6mm by...")
2) The waypoint credit message ("Waypoints created by...")
3) The ping, which seems to be impossible to change.
I mean, I can't judge that, of course, being a complete ignoramus when it comes to coding and stuff, but I think I remember some 1337 people said so.
Well, at least 1) and 2) can theoretically be fixed...
Oh, and are you going to run default maps or custom maps?