domain mapping on a shared hosting account

I have set domain mapping up a couple times on vps with a dedicated IP but wondering if its possible to set it up on shared hosting with a shared IP.

AKA i know i can point the sub domain to the domain but can i create an a record to point to the shared IP and have it work?

thanks
BTW i love the redesign - i guess its been a while since i was here :wink: