I'd like to propose an enhancement on split chart aggregation.

Now, you can select either rows or columns when splitting charts, but when there is more such sub-graphs, they become uncomfortable to work with (I have 8 columns on 24'' display). Having option to set amount of sub-graphs per row/column and then wrap would be great. Also, visually separate columns/rows in split graph (there is now very tiny line, but it is almost invisible). I am thinking of white/light gray alternation that will not interfere with actual content