Many wikis have some code in their MediaWiki:Common.js to make elements collapsible with an additional feature that jquery.makeCollapsible doesn't have: Whether an element is initially collapsed or not depends on the number of such elements, if there are many either all or all but the first few are collapsed, if there are only a few they are initially uncollapsed. Just three examples:
- MediaWiki:Common.js (search for autoCollapse)
- de:MediaWiki:Common.js (search for showDefaultCount)
It would be nice if jquery.makeCollapsible supported this feature natively. The number how many elements are "few" should be user-configurable, a hidden user option prefixed with "userjs-" is probably enough (can be set permanently via API or just on client side per User:/common.js). I'm not sure whether all elements should be collapsed or just all but the first few (as implemented in en.wikipedia), or perhaps even both (of course I have a personal opinion on that, but as I'm German and like to play nethack I'm a bit biased).