I know you're not playing, but though it can't hurt to ask. :)

Currently, buttons whose popup is set to top/bottom flow their buttons from left to right horizontally and I see no way to change that behavior. This means that when you have a bar that is close to the right side of the game window, popups (if there are enough entries and you want to limit the height of the popup) flow off the screen. It would be very useful if we could change that behavior, or have it be inherent in the Align Buttons choices, e.g. choosing an alignment that's any version of left would flow the buttons left to right and choosing any version of right would flow the buttons right to left.

It's unlikely that I would have time to add any new features like this, but I'll leave this open in case that changes or someone else wants to contribute.