o Do you keep track of owner participation (lineup exports, etc)?
Yes, check out our GM list for details @ www.ourfamiglia.com/OOTP/FORT
o Do you require owners to respond if they are going to be returning for the next season?
Yes, we do an activity check each post-season
o What do you consider to be an unacceptable percentage of lineup exports (not including opening day which should be 100% participation IMO)?
We require a minimum of 1 export per week or email or post on forums astating no changes
o Do you consider a lack of lineup export by an owner to be a sign of non-participation of a sign that no changes were needed?
It depends on the sutuation. In FORT last 3 times I did an activity check EVERY team responded within 36 hours. Generally if somebody does not do an export I assume they are out of town, or did not need to make any changes.
o Do you ask or require owners to submit lineups even if they have no changes to make?
Read above, we require 1 export per week minimum.