findermacossidebar
I have:
I'd like to create something like:
My Favorites is getting a little cluttered with shortcuts to a DropBox folder, a SkyDrive folder, a Google Drive folder, an IDrive folder, etc.
How can I create a new group for items in the Sidebar in Finder?
I doubt there's a SIMBL plugin to do that. What you're asking for would be a fairly extensive rewrite even if you had the source code for the Finder.
Your best bets are what @jtbandes and @Richard's comments on your question state: get a Finder replacement that does that or use list view in the Finder.
Drag the folder to the desired position in the sidebar. This adds the folder to the sidebar in every current and future Finder window, as well as Finder Open/Save windows/sheets.
Removal is done by dragging the folder from the sidebar out to the side.
Best Answer
No. You can rearrange the order of the three you mentioned though - just click and drag to move them.
A possible workaround would be to create a new folder, say "Cloud files", and put it in the sidebar. You could then place aliases of your other folders into that one. This would help trim down the folders in your Favorites section, as well as keep the same quick access to them.