Is there any way to initial a script to run when there is an allocation change?  I would be looking for it to happen whenever any pending fulfillment order has an change in the committed column or back ordered column.

I know I can trigger them on the creation of transactions like assembly builds or item receipts but these wouldn't capture inventory reallocation events.

I would like it because I have created a custom field that pulls (via script) any items that list backordered on a Sales Order so the customer can be emailed more easily.  It already updates whenever an order is approved or saved (user events) but if something happens behind the scenes the best thing I have come up with so far is a scheduled script that would run every hour.  I am looking for something more immediate than that.