Technical stuff (Only issues I've encountered):
1. Nerf the pistols by reducing their accuracy.
2. Fix 3rd person if it's possible. Hardcoded
3. Implement new factions.
4. If possible, add an option to only display your own kills.
5. Delete if possible all NW maps. Server side issue.
6. Add urban city maps, for close quaters combat.
Social stuff (Most important):
1. Organize regular OPEN PUBLIC events once a week, events in which clans participate but public players can join as they wish.
2. Organize regular CLOSED PUBLIC events once a week, events which are more organized but public players can join.
3. Try and kill the bot siege servers, as it drains the population from the main part of the game.
4. Find a way to advertise the modification more via YouTube and other means. See if you can find someone to do that stuff.
This would amount to two events a week. I can't stress enough how important the events are in keeping the mod alive. Also, I can't stress enough how closing those events from the public kills the mod, because it puts aside the population that keeps it alive - pubbies. My advice is to start organizing events once you have fixed these technical issues of the game.
One thing that would make this mod explode in population would be adding a territory war system, similar to the one CRPG uses because without persistence all are doomed to fail. I know this will never happen, but I have the right to dream
So far, the mod is amazing. I wish you all the best luck and I hope to see it up and running for a long time.