You'd have to check idotz terms specifically ( I don't use them, so don't know. ), but all the other major registrars ( enom, moniker, godaddy, etc.) allow instant pushes.
Honest question, and I'm not being a smartass, but more making a point... You know that when you register domain names there are lengthy agreements that you agree to when you register... most of the information is contained in those agreements, as well as other points of interest that many would-be-domainers would do well to read.
-Allan