I know this was touched on 3 years ago with no solution from TubePress.
Now to be clear we are talking about the player not being responsive. yes we can set height & width of the player via the options but only using px settings and not percentage. Don't know if adding the choice of PX or percentage to that setting would work?
I've seen some hacks mentioned but was wondering if the company was going to (or maybe has) come up with something.