now i totally understand how it works, i think maybe i should have read your 'readme' file a little better. i didnt stop to think about if it was a first post or a reply to a post so with this conclusion it works 100% with no probs.
anyway here are a few MODS off the top of my head that i have installed on my forum...
Blank Template MOD (33 pages some hidden)
Online Users Today MOD
www removal when registering MOD
Users viewing forum on Index
spam-junk mail in agreement
Rank Info mod
Marquee Site Description
Fix For The Firefox Remember Passwords Problem
Adds users rank to memberlist ver: 1.0.2
Forum Icon with ACP Control (Default Option) VER: 1.1.0
Report to Moderators MOD
update session on page change 1_0_0
Save Bandwidth MOD VER: 1.0.0
my phpbb version is VER: 2.0.21
there are many more that ive added and there are quite a few custom mods of my own.
i hope this info helps you with the development of this MOD
if you want to see some of my MODs then feel free to have a look here > http://dchubad.sytes.net/dchubad