A problem I've encountered running this mod is captains are able to select spectators in the captains menu

I was hoping for larger games other then 8vs8

I did this mod exactly because of what you say, manually doing captains is cumbersome and has lots of waiting involved, but still is a better option if everyone knows the relative skill of each other since it can lead to more balanced matches than shuffle.
If it happens to be adopted in your server let me know what was your experience.

@WhitelightningTwister NS2 Sudamerica 8v8

Looking forward to playing with this! I was on TA's captains server this past weekend, and we had a hard time picking teams because randoms and rooks would join in. Took like ten minutes! Hopefully they adopt your mod to help with that.

Any servers running this?

Great work!