I think it would be useful to be able to change the "Battery Bar" to a horizontal layout. Also with this it would be nice to choose a length. The reason I though about this is because I use a small panel (20-25px) and It is close to useless to have it upright. I would prefer to have it sideways and a custom length.
Likely not happening, since we're trying to have consistency across plugins.. and it's already a task hard enough.