modules directory

[Christ Schlacta]

I've found something odd in regard to the modules directory.  I ended up 
needing to use checkval module for ldap authentication to work properly 
for me.  the documentation I found said to place the following in config 
files:

checkval {
         item-name = Calling-Station-Id
         check-name = Calling-Station-Id
         data-type = string
         notfound-reject = no
}

at the location I wanted the check to occur, but instead I ended up 
needing to use just:

checkval

because the above code was located in modules/checkval .

The question is at this point, how could I, for example, have two 
different checkval checks?  suppose I want to check an additional 
attribute?  I recon I need a new file, but I'm not sure if it matters 
what I call the new file, or, for that matter, I'm not sure what to put 
inside the new file, except that I'm sure it must look very similar to 
that above.

if someone could explain the specifics of this, or tell me where to find 
them explained, I would much appreciate the help.

one more question:  can there be multiples of ANY module specified?  for 
example, can I use two different ldap or sql modules if I were to need 
to (just as a bad example, I propose: 1 radius server, 2 wlans with 
different user bases that can't be merged into one directory for 
whatever reasons).