Is there a thread similar to the one where people can post which indie games that they'd like to see come to GOG with links to their respective Dreamlist entries but for features/GOG Galaxy?

If not, would such a thread be allowed?

There's a Galaxy section in the old wishlist: https://www.gog.com/wishlist/galaxy
And an entire forum section: https://www.gog.com/forum/general_beta_gog_galaxy_2.0
About specific threads, don't know.

maybe

Not exactly one particular thread, but:
https://www.gog.com/wishlist/site (features)
https://www.gog.com/wishlist/galaxy (galaxy)

Yes, I know about those lists.

I made a post there for a feature that I'd like to see but it has barely gotten any traction and I don't know if it has got any visibility.

I am currently experiencing the issue again as to why I made that entry to begin with.

I created a "promote your most-wanted Community Wishlist entries" thread (intended to be mainly focused on site & Galaxy features) a while back, but it hasn't seen much use so far, and I don't really want to bump it artificially just to boost visibility. You might as well make your case for your pet feature in there. :)

Thank you, I'll do just that.