The logout timer has now been in trunk for quite a while and I think many schools are using this. There is a small performance penalty for using this timer, but I recently reduced the performance penalty (
I suggest this change:
When this was originally introduced, I think that the feature defaulted to "off" - but I think that enough time has passed that we should switch the default to "on" for Sakai 2.8
The problem with leaving this off is that it really will not be tested with the default off and folks will be unaware of the feature.
Schools who do not want the feature can easily turn it off in Sakai 2.8.