If, like me, you sometimes like doing stuff in time sigs other than 4/4, here's how you can do it on the 4/4-only 303...

Basically, you swap the beats you want per bar with the number of bars.

E.g.
Say you want 4 bars of 5/4 (20 beats in total), make your sequence 5 bars of 4/4 (which will be the same, 20 beats). You'll have to ignore the accented metronome clicks and then once you have your drums sequenced, you can turn off the metronome.

If you want 4 bars of 7/4, similarly, make your sequence 7 bars of 4/4.
If you want 8 bars of 7/4, make your sequence 14 bars of 4/4 (double the 4 bars, so double the 7 bars)

If you want one bar of 7/4 followed by a bar of 6/4 x4, do 13 (7+6) bars of 4/4.

And so on.

Mathtastic!