My group and I have been playing with this mod for a while, and I at least have some ideas for suggestions that could make it a little better.

1) Spots for additional little items. By 9th level you can hold 5 little items, but there's only spots for 3.
2) Quick add for Curse/Bless cards. A little button somewhere to add one of those to your modifier deck automatically would be nice. Maybe even in the battle interface?
3) Visual indicator of long rest other than in the text log. Like, a little icon between the two initiative cards or something? I keep having to double check the text log to make sure someone is resting.
4) Hotkeys for conditions. I actually wrote a little script for this myself, where it'll drop the token on a mini when I press a button (I currently have them gamekeyed to the keyboard numbers, which works until I try to draw cards). But something to make conditions a little quicker, especially since the stacks tend to be pretty far below the map. Could add to the battle interface as well buttons for adding/removing conditions from yourself.
5) A way to set the level of a monster mini. There are a couple scenarios where something is like a boss, but is described as an "X, but one level higher than the scenario level" or similar. I haven't been able to figure out a good way of accomplishing this; spawning a monster just matched the current scenario level, even if I changed it there. Maybe this could be an additional toggle when you click the health bar to switch between normal/elite?
6) Similarly, a way to change up the help texts that appear on monster minis. Occasionally, this will miss things like shield or something. I'd like to have a way to add that manually so that we don't forget.
7) Hover text over traps on the map to detail what kind they are, and a button on the traps to 'trigger' them, and remove them from the game.
8) Add a "Loot" action. Ideally, this would be context menu, but I'm not sure that's feasible with TTS current state. So, maybe another condition? Like, we can have a Loot 1, Loot 2, Loot 3, or Loot 4 condition, and when you have that condition and end your turn, you grab all coins/treasure from that distance away? We've kind of been grabbing all the coins and stacking them in the spot we're going to end our turn (because it's quicker than dragging it all to the mat), but a quicker way of doing that would be awesome.
9) I'd love it if the initiative GUI could show you the PC cards as well. Right now, we use PiP to see our own cards while looking at the map, But being able to see them in the initiative would be cool too.
10) Similarly, buttons in the battle interface to Discard/Active/Lose PC cards. Since buttons in PiP don't work, we still have to pan down to the game mat to get rid of them. Alternatively, maybe just discard anything still on the mat when "End Round" is pressed?
11) A short rest button on the gui. I left this for last because of the whole "take a damage to change your lost card" thing, which makes it a bit questionable, but I could see it working. One button to start short rest, then two buttons replace it, one to finish short rest, and one to replace the lost card and finish the short rest. This isn't huge by any means, but anything to speed up play.

Lots of ideas, mostly fairly small I would imagine. I really do like this mod, but as with anything you use fairly often, you tend to get these little "wouldn't it be nice if..."s going on.