I've used superscripts as footnote references a few times (e.g., my answer in ...close-vim-from-the-command-line ) .

Is it possible to link these so that they jump down to the appropriate place (such as the bottom/foot of the answer) when clicked on?

This is probably overkill, as answers are not usually so long that they aren't visually scan-able. But this is the only case so far in which I've missed wikipedia's markup features.