Basically the idea I have in mind is that the admin can click some CSS edit button on his/her account, and there would be some sorta "Edit" button on the forum, he/she can click any part of the forum and a popup would appear allowing him/her to change the colors, fonts, images, etc... on the fly and save. Think Quick Edit for posting, but this would be like Quick CSS instead.

It would make it so easy to create skins, or at least fix a color issue, or edit something on the forum itself, on the fly WYSIWYG, instead of treading through a massive CSS file not having much of a clue what is being affected and having to reload the forum 20,000 times.

cool idea, but might be a problem for supporting drastic skin changes.

i don't think they'll likely to implement it though as it would take quite some development...

It would be amazing but it would take forever to make it happen.