This topic isn't about clans I think.
There's been lots of threads about what the vast majority of players don't like about this game right now. If I understand right you wanna start coding something again? There are yeah, pretty many things, but everyone has different view on it, but the main thing is to make something stable everyone can use equally and the other thing is that there is 1000 functions that are not necessary and make the game too heavy.
I could list a few bigger ones I can remember right now:
*You shouldn't see if you hit enemy or enemy's health-bar
*Lot's of gusanos things
*All those size, speed etc multipliers.
*All the things under "Other" in OLX game settings->unstable
*Rifles, lasers and other mod issues
And of course a better looking graphics for levels and skins and mods would always help.
The list was mostly based on my opinion so yeah, don't start arguing about that. I'm not 100% sure who would come back if things got better, RC3 is decent to play with if you try to ignore some things, most players currently play this due to long-lasting relations with the game and other players. There might be lots of players who have quit to feel the old game again if it was bit different, more 0.56-alike.
There still are players, yesterday I hosted was 12 people in my server and 8 or so in other servers.