Well on GM cars they use the high beams as the DRLs. Operated at 50%, or some such % of power, so as not to be offensive.
If Ford also uses the reduced power for their DRLs then I cant see why you cant make the high beams your DRLs. Seems like it would just be switching a few wires.
It is easy to say but I have no idea how to do it or if it can be done.
Anyway thats my 2 cents worth of information.
I would still like to know what years have the 4 bulb system as opposed to the 2 (9007) bulb system.