Hi, thanks for your review and I'm glad you've found Tab Stash useful!
Feature requests are tracked on GitHub, you can see the entire list here: https://github.com/josh-berry/tab-stash/labels/i-enhancement
Looks like there is one filed for pinning groups already (feel free to subscribe to the issue for updates): https://github.com/josh-berry/tab-stash/issues/124
I don't think we have one yet for changing the order of the groups, but if you'd like to file a new one and share any additional details/thoughts that might be helpful, here's where to go: https://github.com/josh-berry/tab-stash/issues/new?template=feature_request.md
