Hi,
The booklet imposition feature in the output presets is doing a good job for small documents.
Now I have 2 projects, where I have to deal with saddle-stitched booklets in the range of 48 to 200 pages per booklet. Because of the booklet size, I have to compensate for the page creep in a control script.
It would be great, if there was an option for a creep compensation factor in the booklet imposition (saddle binding). This is pretty easy to calculate and hides the mess, when one does it through scripting 
best regards
ivan