Read my first answer :
From the begining i was talking about fun_plug , so i don't understand your question as fun_plug include lighttpd ...
Let me ask you a simple question. Does the NAS by default come with a web server (aka lighttpd)? If yes then why the need to install another one? This is what I was trying to point out but apparently you just don't get it.
To put in layman term, it's possible to setup additional web apps using the default web server and that includes AjaXplorer. Of course fun_plug is still needed but only for shell access.
And from the beginning, I was hoping for a detail instruction on the setup/config of AjaXplorer since you had done it before but not on this NAS. I have encountered error and is still looking for a solution.
Hope I made myself clear this time round.