Coming in a little late on the feedback with the new interface. I understand why you hooked into the manual roll interface, but I definitely agree with the other posters that it makes it more complicated for the players.
Previously, they had a simple button to click which was to roll the dice and was very clearly from the extension saying it was a roll request. Now, they are provided with a popup that simply reads manual dice entry, and they have to know that they are supposed to click the dice icon. If they click the green checkbox (which from a UI perspective is the most logical), then they get a 0 on the roll, because that's what in the manual roll. This is where the confusion is. I really like the simplicity of the single button roll choice with their portrait..
Would you consider an option that can be enabled/disabled by the GM for the method that they want to use? If a table already uses manual rolls, they understand the interface. For others, it's confusing and can easily be done incorrectly.
You have an option in there about "PC: Prompt Owner to roll saves". That doesn't seem to be effective any more because of the manual roll interface. Even if it's turned off, the owner is still prompted to roll.
As a GM, I'm also noticing that the "pending" is not working.. Previously, I would see a red square around all of the pending rolls characters hadn't completed.. Now, I have no idea when I've clicked on a request if they got it or not.

