Currently, overlay extensions only overlay the video on PC.

Please allow overlay extensions to overlay the video on mobile too.

Add the "Extensions" feature to Twitch Studio! Rather irritating that it's not available on the official studio software.

Today extensions (overlay extensions) are only available on certain web browsers (for PC/MAC).
Make it available/work on all browsers.

Today extensions (overlays) don´t work on mobile and tablets (apps).
Make it available/work on mobile and tablet apps.

Please also find a way to make extensions synced, be able to be used in replays/VOD´s/Clips.

Make it possible to add editor credentials to another Twitch user to edit one's overlays and select the one in-use. Make it possible to add editor credentials to another Twitch user/account to edit one's overlays and select the one in-use. It would avoid security issues from sharing passwords in order to create/edit/select overlays.

Right now if a twitch extension gets denied and needs developer to re-submit, the review notes are all gone. It would be great if for the same extension it would keep the review notes. I had an app that had a backend issue that I resolved, but I had to re-submit the app (didn't upload any new files or change anything), and the review details was empty.

An extension to display the local time of the person who's watching on the video player to allow for time management.

The current small number of merch-selling extensions are not very good or reliable, but developers aren't allowed to build any extensions to compete with them.