I would like to strongly endorse the feature request proposed here:-
http://extjs.com/forum/showthread.php?t=37219

I have had to make willydee's change in my local, minnified copy of the ExtJs source in order to get this functionality. Under certain circumstances I have to alter the value in the record before the edit, and restore the previous value afterwards. So I have to have an after-editing event of one sort of another, even if the user cancelled the edit or re-entered the exact same value.

I have found that willydee's solution of introducing a 'forceValidation' flag to be the most elegant solution here.

If it was introduced into the product, I'd be most grateful. Thanks.