raise POST_MAX after instantiation

I have POST_MAX set at 10k when i instantiate an apache2::request  
object and stash it in a context object at the start of my modperl  
handler

annoyingly, i've run into a situation where a single page needs ~50k  
of post data

what is the standard method for dealing with that? i think the only  
way to deal with this might be trying to figure out if i'm  
dispatching to the 'fat' page before i instantiate the request  
object.  am i right?