Paragraph styles support a "drop cap" of the first character or word. Now, when using drop caps, one often wants to play with aspects of the font, draw a border around the drop cap etc. That can be achieved either with a Character Style. It therefore makes sense to specify a CS to set the drop cap in, which may be different than the paragraph's "own" CS features. Inspired by: Bug 70180.
It's already possible to assign character styles to drop caps, just pick one from the "character style" drop down list under "Contents" when "Display drop caps" is checked.
(In reply to RGB from comment #1) > It's already possible to assign character styles to drop caps You're right, sorry.
WORKSFORME is for "there was a problem, but at some point, the problem disappeared as a result of unknown changes". In this case, INVALID fits best, since the issue did not exist, so the bug report told things that weren't true (it told that it's not possible to do A, when it was a user mistake).