Regarding the action bar. I find it somewhat cumbersome to have to activate the action bar, and then to cancel it (or select move) to move a character. It would be more convenient to always have "move" as an option when you select a character. To deal with the "action" portion, make the action bar permanently attached to the bottom (possibly as a popup). Or configurable as to where it's attached, for those who may prefer it on the side, or up top). That way, every time you select a character, it shows their actions.
Also, it would be nice if we could still select a character who can no longer move. I had one character level up after their turn finished, and I wanted to see the new options available, but I was unable to until their next turn.
Finally, it would be helpful - in cases where you just want to use a mouse - to be able to click off (either left or right) from a character, and stop controlling that specific character, without having to select a new one. Preferably right-click, but possibly left clicking outside of their AoM (area of movement) would be practical, too.