Optional automatic section numbering would help reading: otherwise, a reader (like me) gets lost in the structure of a long page.
I guess it is implementable with complex CSS... but one has first to compose this CSS in any case. So, this wish still has a todo status. --Ivan Z.
And another aspect why this is related to ikiwiki, not just authoring a CSS, is that the style of the numbers (genereated by CSS probably) should match the style of the numbers in ikiwiki's toc. --Ivan Z.