I run USB sticks -- whether plastic or rubberized or mostly metal -- off the Shield on a fairly regular basis. Talking about 2 hour movies, or multiple programs in a row here. None of the sticks ever got hot, maybe just a bit warm sometimes. No other significant problems worth noting.

As to DumbAsPost's query, to reiterate: I do Ffwd. / Rev. in VLC on the Shield, but I never "clocked" what the increments for those may be. Bear in mind that this is in VLC player for Android, and that I'm using a non-standard, third-party remote -- which may complicate the answer on that.