It would be nice if during combat the creature whose turn it is would act fully, including display of floaty text and sound, before the next creature acts. Right now at least the floaty text appears very bundled after all creatures have acted which makes it hard to grasp to which creature which attacks belongs.
Edit: It's likely just a subjective impression - creatures do act one after another after all, but sometimes all the floaty text for them somehow gets "queued" somehow and then appears all at once in a huge mass.
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Furthermore it would be great if the acting creature would get a highlight marker over its token/sprite while it acts. Would go a long way in helping to understand quickly what's going on (at least for those creature without attack animations).
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I think I mentioned that one beforehand, but just in case, it also would increase overview in battle if mouseover over the name of a creature in the initiative list would highlight the creature on the battlefield (and vice versa: mouseover creature token and highlight name in list). This is especially needed as many creatures will share the exact same name.
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Finally it would be really welcome if a module authors could somehow influence which information is shown in the creature info box. Right now it's just hitpoints, but there's much more potential here (think vulnerabilities, strategic clues, ambience description, more stats info...).