how about some sad git (go on, you know you want to :p ) working out the effect (if any) of all these combinations on the actual standings at the end of each season ? :)
After we can all say it's pointless (no pun in 10 did), as the better off would have adjusted their drives to make the most of the prevailing system at the time anyway :p
http://smileys.smileycentral.com/cat/16/16_3_166.gif