I find this question so strange ... as in, why is it even a concern?
But supported or not, my Debian servers have no issues running 32-bit userland apps. 'apt-get install ia32-libs' should be all you need.
My desktop is Ubuntu, and it appears that this package is also required for flash (nonfree). Now, as for stability I can't say I have _too_ many problems, but I wouldn't attribute any I do have to 32bit-ness.