I think it is. Ideally there would be threads etc., maybe this will come eventually – it’s for the Mozilla Discourse people to decide, assuming it is possible at all.
Not yet, it’s a long standing open issue (dated Sept. 2014, an old issue on the now abandoned uBlock).
I will try to see what can be done for the next version – especially that with 1.6.0 it can happen that the “Block Element” entry in the context menu may end up in a submenu.