how often do they add qol stuff

i want more qol stuff now

With almost every patch.

You could give them some ideas, you know?

What sort of QoL are we talking about? (Minor) Bug fixes? Pretty much every patch, even if it may not be a particular bug that you want patched.

If you're talking about the sort of QoL that pertains to substantial adjustment, such as balancing out rewards to reflect the age of content, then maybe several times a year. RMT related stuff though, don't expect any.