A few settings things to improve usability:
1. A tuner that show both the note and the amount out or +/- at the same time, I often need to tune without hearing the sound. Also helps those who use a drop tuning.
2. Auto correct presets for different keys, to change keys or other parameters you now have to go 4 menu levels deep.
3. Basic guitar preamp chain with tube preamp+ low ratio comp( 2:1+ spring reverb+ hum and high frequency noise filters. Top level menus for (Gain, Comp Threshold, Reverb Depth, HF cutoff