Yes, that is best. At this time though, sidebar blocks are not configurable on a per-article basis. It's something we have wanted to add since we first created the sidebar, but it's a major new feature, and we didn't want to build something like that until we had a number of other sidebar blocks to choose from.
I think currently we still need:
Social bookmarks
Related pages (based on categories - I mentioned this somewhere or it's in our notes from a meeting here)
As a replacement for 'showthreads'
Something like an 'areaindex' BB-Code would create
Allow the Book TOC block to replace 'bookindex'
Polls
Otherwise, it is possible to make custom sidebar blocks already using BB-Code (something like this should ideally be utilized for infoboxes)
With DIV position="sidebar" and TABLE position="sidebar"