To have a bi directional preset scroll ability either use an auxiliary footswitch to scroll down ( ihave triple switch, scroll down, tap tempo, and bank/play mode) or if you hit the bank up switch and turn the encoder in either direction within 2 seconds, you can scroll up or down on the unit like a rack effect. Granted it's not as easy as a footcontroller, but rack effects need an external controller as well.
The display is a bit "dot matrix" looking, but as far as being hard to read in the daylight, most screens on FX units are, so it's hard to fault Eventide for that.
Get a good (even decent) midi controller like kdavies suggested and it takes care of both problems for you if you need to go that far. The only "missed opportunity" I've experienced with my TimeFactor and Modfactor pedals is the chance to lug around 6 or 7 other pedals in order to get equal or often inferior sound quality.