Floating tool box
Instead of a top tool bar, having the option of a floating toolbox much like in onenote for windows would be great. The floating toolbox could be customisable to hold a choice of different tools such as hi light, underline, shapes etc.
please have this. it would be really useful. especially for tab users reading in portrait mode. we can simply change between our personal favourite tool with just a thumb. that would definitely increase productivity.