Please please . Pet peeve is not being able to scroll in PDF or browser by hitting spacebar, which is a big, easy to tap target, helps move as quickly as possible through document without missing anything, and is less processor-intensive & battery draining than scrolling w/trackpad.
Just tried. Seems even if the PDF has the focus, the arrows move among mind map nodes. Again, having spacebar scroll the PDF by a screenful would be very helpful