Hardcoded HTML
vBulletin considers hardcoded HTML a bug
Certain VaultWiki areas, such as Recentchanges, Contributions, and the Table of Contents generator, have HTML hardcoded into the functions. This limits the amount of customization that can be done at the admin level, and can drive some admins (like myself) crazy when they can't seem to find the code. Change these to templates, even if they are small and seemingly pointless.