Suggested by @grrrmml: Maybe you could add possibility to start final rounds on knock-out basis. Like quarter-, semi-finals, small final and final.
It seems to me that one way could be to start a new tournament with the top 8 or so players and have a different tournament system (like single elimination) for this tournament. The drawback would be that there would be no connection between this tournaments (so far) so one could i.e. not send one final list of standings. Is such an link necessary or desirable? What would you say?