The hotfix (20211202-4c519292a1-win_x86-devprev or the equivalent) fixed a lot of issues, but not these.
I don't think Alt-t ever opened the tracks window by default, but you can set this option in "Configure Keyboard Shortcuts, under General Options -> Controls -> General -> Tracks.
Keyboard shortcuts are usually written Alt+T, meaning "hold down the alt key and press lowercase t". The uppercase version would be "Shift+Alt+T". Alt+T and Alt+t would be the same in this convention.
Alt-T (lowercase "t") starts the wiggle backbone tool. This is a bug, it should be just T (lowercase "t").
When I try to set Alt-T to open tracks, it still starts backbone wiggle. Hotkeys.txt is correctly updated, and there's no mention of Alt-T already being assigned. So another bug or two there.
Shift-Alt-T does nothing. This is correct.
I'm still not sure what "delete all offline progress" does. I've been too afraid to try it. I don't think the Foldit team has ever mentioned it. I'll try it sometime soon for the wiki. If you never hear from me again, that's the reason.
I'm not sure about "reset roles", either.
Screen sizes are an issue off and on. Some players have problems with certain recipes that have lots of options in their dialogs. One item that might help is knowing your screen size and related settings.
On Windows 10, if you right-click a blank spot on the screen, and select "Display settings", the "Scale and layout" area has "Change the size of apps, text, and other items", which might be "125%", and "Display resolution", which might "1024x768". There's also "Advanced scaling settings", which has a "Custom scaling" option that's not recommended. At least knowing the standard scaling and display resolution would be useful to the developers.
The help section in general needs work, and the Advanced Hotkeys section of help is a mess, with some of the shortcuts reflecting original interface values. There are still references to modes, even to a "selection mode".