Thanks for the nice write-up! I'll give some inside info as to the details of what I know regarding these various problems.
Automatic Recording won't Capture in 60fps: Not really aware of this being a trend. Is it in all games or just Rocket League?
1 Bookmarks: Rocket League recording is not working as intended currently, we do have a fix intended to go out that will correct it.
2 Pins: Same as above. If it's unable to record properly, pins won't apply to it.
3 Editing: This issue is very new but we're made aware due to the volume of tickets. I'll need to write up a report on it and check user logs to see if it's a local issue or an error in the client.
4 Uploading: We've had reports of the Upload issue and Processing, but it's difficult to pin-point the exact reason it's happening. We do have an internal bug ticket on it, but it's difficult (if not impossible) for us to recreate. But we still are very aware of it and want to correct it.
1 Multi-Select Videos: I personally like it! I have already requested that be put in, but the more voices behind it, the better.
2 Export to Browse: You'll have to be more specific. Do you mean Export a video that is already uploaded? Export a video portion that has been Edited?
3 Pin Integration on Saves: I think we looked into this, but personally unsure of the tech behind it or why it's not there.
4 New UI: Feel free and provide mock-ups, examples, etc.
5 Multiple Video Editing: Same as your first suggestion! Although I know we don't want to get too heavy in the editing dept where we basically become a video-editing software, but I understand the request for diversity!