Yes, at least in theory. I haven't tried to modify the WHS Remote Access web site in the way you're discussing, however.
See e.g.
this article on Technet. Remember that what you want to do is unsupported, and there is a (significant, IMO) risk that you will break your Remote Access web site in a way that you will not easily be able to fix, i.e. there is a chance that a server reinstallation is in your immediate future.
I'm not on the WHS team, I just post a lot. :)