I've been looking through the source trying to work out
a good way to change the 'include' path setting on a
per application basis.  Rather than have just one default
directory, i'd like to be able to set it based on the
'application'.  I'm thinking a possible way to do this
would be to set in the ini file, a list of 'application'
script names that php would recognise, and the 'include'
directory for that application.

Either that, or some way to change it mid-script.  Although
for security reasons, I think everyone would prefer the
.ini method.