I have to laugh at the claims it is a "minor european league" and "boring". Considering the SPL for the last three years has had a lot more drama and excitment than the one horse race of the premiership. Anyway, to the point, there are currently playoffs for second-bottom of the SPL and Division 1's second place, i believe that with only twelve teams the league should have no play-off. As for the other, 10 club divisions, id say 2 up, 2 down too.
Unless they extend the SPl from 12 to 16 teams, and do the same with div 1. Then a playoff would be good, but i dont see the top 12 letting another 4 teams share the television money. the problem lies at the moment with clubs unabe to meet the ridiculous criteria of the SPl, ie under soil heating, all seater stadiums etc, which clubs being promoted to the SPL have to deal with, and generally it hurts them financially and they cant cope. For this reason, Inverness Caley Thistle had to travel half a season to Aberdeen to play home matches, ridiculous when their stadia is in a small city and was more than capable of holding enough fans.
Until they get rid of the ott criteria of stadia, they cant get rid of the playoff: it filters out another club which could potentially cause problems with upgrading their stadia or them not being allowed to play in the league anyway. Just ask falkirk.