Allowing a user to renice Xorg

[erron1]

I've edited /etc/security/limits.conf in order to allow a user to renice processes.
In limits.conf :
@erron - nice -10 # values from -10 to 19 allowed
@erron - rtprio 9 # values from 1 to 99 allowed

But renicing Xorg still fails with permission denied, and is only possible using sudo.
Is it possible somehow to allow a normal user to renice Xorg?

[Head_on_a_Stick]

Try Arch instead, that runs X rootless

I think testing/unstable also does this.