Ability to control the sleep interval between two lock retries in acquire API

Acquire prototype is:
  def acquire(self, timeout=None)
I would like to control the sleep time between two lock tries in the call to time.sleep. Today the sleep time is timeout/10.
My proposal is to add to interval argument to acquire:
  def acquire(self, timeout=None, interval=None)
If interval is None, then do the same calculation as today in the time.sleep (for backward compatibility). Otherwise use that interval.