Currently all panes are equal-sized, shrinking to the size of the largest entry.

You can work around this by creating a field which concatenates the two fields into one value and splitting by that instead of splitting and paning. But it won't be as clear.

Can we make unequal-sized panes an idea?

Thanks,

Done. Idea: Irregular pane size. Please vote.

This would be very helpful to us as well. The functionality of being able to split by more than one field is in fact severely limited by then having equal pain/split distributions.