Pretty self explanatory really. I've made a CTF map that would work really well if I could get a neutral flag to spawn however I don't seem to have been able to do this. Or at least I can't find an option to award the neutral spawn more points. Please don't judge me on my ignorance.
I do not believe this is possible. None of the on-disc maps have a neutral flag set up. However, 4-flag (four teams, each with their own flag) is possible and is actually set up on several of the maps. I'm a lot more pissed about the lack of one flag than the lack of neutral flag, but this is unfortunate also.
Neutral flag alone might be possible using Grifball (not sure on the specifics) if you're not going for realism. However, I don't believe 3 flag in the way you are describing it is possible.
Your allowed up to 4 teams in CTF but they all have to have there own flag Grifball only allows 2 teams so you can make a 2 teamed neutral throwable "flag" gametype If wanna make one flag you can use grifball and delete one sides capture plate then set score to win 1. But that's only one round so its not ideal.(it doesn't rotate teams for more then one round, Can't use CTF because capture plate is same item as flag spawn)
Thanks for the responses. I think I'll just leave it at two flag for the moment. Hopefully they add the ability to post screenshots to the web soon so I can get the damn thing tested.