32bit compatibility mode with 64bit distros

[Christopher Chisholm]

Hey Everyone,

I have a question for everyone out there running x64 distros, 
particularly those that use them in a corporate or otherwise 
professional environment.  When you install, do you generally install 
32bit compatible mode, or do you run in a pure 64bit environment?

The reason I ask is that the software my company makes utilizes PAM for 
authentication (you may remember my PAM-related e-mail).  The 
authentication module we came up with links with PAM libraries, but 
currently on in 32 bit systems and 64 bit systems with compatibility 
mode.  My boss is really pushing to get our version 3.00 out the door 
(which there will be a free version of- i'll explain more when we're 
closer to release). 

I'm wondering if placing a requirement to have 32 bit compatibility mode 
installed would be a huge pain for people, or if this is standard 
practice anyway or no big deal?  Any feedback would be welcome.

-Chris