Roman numerals fixed in the next release. This only affects vBulletin 4. vBulletin 3 uses inline style attributes to set roman numerals, and XenForo doesn't support them at all.
As for "Collapsible List", VaultWiki doesn't have a built-in function to do this. Even Wikipedia uses a template that calls a custom module to do this. VaultWiki does not yet ship with pre-defined templates.
However, it is possible to make collapsible content using a combination of DIVs with certain class names, like so:
Code:
[div] class="vw-collapse-head" | [span] class="vw-collapse-ctrl" id="vw-collapse-ctrl_mycollapse_targetname" | hide[/span][h=3]A Nice Heading[/h][/div]
[div] id="vw-collapse_mycollapse_targetname" |
... content that will be collapsed ...
[/div]
It should be easy enough to turn this into a template if you want.
Let me note that RC 2 requires a value of "hide" for the SPAN text, as above. However, it looks strange once the control is toggled, because icons start appearing too. This is fixed in RC 3. Also in RC 3, you can give the SPAN an additional class of vw-fa-hide and empty text to use icons instead.
Marking as fixed in the next release.