ILE questions: activation groups, rpg-cgi, classic web server.

sorry for the double post (rpg and web lists) - didn't know which would be
more appropriate, or would get the quickest/most responses.

Ok, I've got a little time in between projects, and I'd like to get serious
about using more ILE concepts.  I've got a little web application that I'd
like to clean up and do "right".

my questions:

I'm really not very hip on activation groups.  Should I use named, *caller,
*new, or default activation groups?  What are the ramifications of each?
(it all seems to work fine using default).

Why can't I use "dftactgrp(*yes)" on CRTBNDRPG if I use the 'H' spec BNDDIR
() keyword, but I can CRTRPGMOD and CRTPGM without naming an activation
group.

how are all of you setting up this environment, ILE-wise?  any tips would
be appreciated.

a little background:
I'm on V4R5, using the classic http server, and the standard QZHBCGI APIs.
I also sometimes use some QC2LE functions.  my cgi programs are reasonably
simple - nothing too tricky.  There are a lot of library list
manipulations, usropn files, a few OVRxxxFs via QCMDEXC and a few C
function calls.

thanks,

rick