It would be nice to have a copy of mode 1 and 2 (the sine waves), but inverted. Much like how The snap waveforms (7 and 8) are with 14 and 15.
Another waveform that would be useful is a ‘wave function’
Another waveform that would be real handy is … random! Or pseudo random. Sometimes you just don’t want it to look like a repeating pattern.