When I come to think about it, this game could also use some more diversity in gameplay mechanics. Specifically the weapons on higher end are quite different from each other (cocker vs Mag obviously comes to mind), but how about Stingray, VM-68 or Trracer? They're all pretty mediocre with no discerning feats and therefore, in vast majority of games/maps I've played over 3 years, omitted. Compare this to other fast paced games - in most of them all weapons are rather well rounded - some have higher rof, some more damage per bullet, some hitscan, some splash dmg. I know it's paintball ffs, so no rocket launcher or laser gun, but some tweaks to make others more distinguishable would be welcome. How about making Trracer have significantly more fps than others (so more range and less compensating for target's movement) but slow rof? Or actual semi aut? Or maybe even shotgun with low fps and rof but shooting 3 or 5 balls at once? Some weapons as of now bring absolutely nothing to the table (faster than previous one, with same range, but maybe with weird firing pattern = when you find Carbine, obviously you ditch it). IMO every weapon should be done so that it could be someone's favourite. Now it's not really the case.
Also as you get basic functionalities like integrated server browser (PW required, GLS required, sorting, filtering, searching and all that basic stuff) and maybe some tutorials, why not think about little polishes in the game? I do not ask for extra high polygons/extra high detailed textures, more like small touches that make overall experience funner. Like CO2 escaping barrels with every shot. That kind of stuff. As I see you already are heading in the right direction, as surface specific sounds, and different splats on barrels are this kind of things I was talking about.