All PMCRs have timing mids in them. Only recently has a program been released that allows the end user to adjust the timing gain. For most, this control is useless. The only people who will make much use of it are those stacking timing boxes (aka Smarty, BDDL, ect) and you want to tune the amount of timing you are getting total.
Like JVolpe said, it can be upgraded, but has to be sent in. SN 5000 and newer can get the adjustable rail pressure program as well.