It's not mentioned here so I'll add it: gnome-flashback is the thing that you can use to integrate your window manager of choice w/ the gnome shell. I expect there to be integrations for other window managers, but if you're using i3, then this is your bridge: https://github.com/deuill/i3-gnome-flashback
Mod + / should bring up the shortcuts xisukar. The i3 config file binds to those keys and toggle launches conky. If it's not working for you please file an issue.
While I agree that Regolith is mostly "skin deep", there are some aspects that transcend just theming, for example gnome integration. Regolith is not intended as a replacement for those happy and comfortable with building packages from source and hand tweaking configuration.
Hi mastrsushi, super-+ and super-- interactively change the size of the gaps and they go to zero. You can edit the i3 config as well to hard set them at 0.