I'm a keyboard player, so I have the advantage of a horizontal surface. I bought an iClever bluetooth number pad to use instead of reaching out to touch my iPad. Under Settings > Remote Control, I configured SLM as follows:
Next song: 6 (right arrow)
Previous song: 4 (left arrow)
Next MIDI preset: 2 (down arrow)
Previous MIDI preset: 8 (up arrow)
Start/stop recording: 5 (I only use this for practicing)
Open/close full-screen document: 3 (when I need to see a chart)