I'll preface this with that what I've seen of the GM Mode via the lovely 4 hour campaign on YouTube with Matt Mercer and others, I love it, but I would suggest to make the UI of the Dice Roller different mainly in the Roll for Stat.
In my opinion, for streamlining it to produce less clicks and less Stat hunt time (as it's currently a very small drop-down list) the Roll for Stat section should be larger vertically or vertically & horizontally (2-3 column table) to list as many Stats as possible (with a scroll wheel and search function) alphabetically with the ability to favorite (a clickable star or something) to sort specific Stats to the top.
Also, buttons to enable Advantage or Disadvantage would be great.
In addition, displaying player Stat modifiers somewhere would be excellent as well.
TL;DR:
- Roll for Stat section is too small as is its drop-down list
- Roll for Stat section, ideally, should be enlarged to list as many stats as possible.
- Roll for Stat section should have favorite functionality so Stats frequently used can be sorted at the top
- Advantage/Disadvantage Toggle Buttons
- Visible player Stat modifiers
