I use the debug/syslog feature heavily and the one line that I don't see a need for is:
TCP:Accept OK (HTTPD)<000>
If you one day decide to clean up the messages, that would be the first one to get rid of ;)
I tried going down to level 6 in the hope that the following messages would still be output:
[DSP]: ---- H/W DTMF ON (level:3) : 1 @ 48640 ms----<000>
..but they stopped and I had to go back to level 7.
A document explaining all debug messages and their levels would be great ;D