We would like to see a function in Koha where the hold limit is separated into two limits.  One limit for on-the-shelf holds and another limit for holds on items checked out.  Currently, we can allow or not allow on-the-shelf holds.  We would like to see this expanded to specify the number of holds allowed if we have on-the-shelf holds turned on.  Then there would be a separate limit that is for items that are checked out or on order.
The reason for separating these is so we can manage staff time on the holds to pull list and still allow patrons to put holds on popular items and items that are new to the library.  Our plan would be to allow something like 7 holds for on-the-shelf holds and allow unlimited holds for checked out and on order items.