Derf, when one decides to step into the world of programming and releasing software for public consumption, and thus, be successful at it, there are many things one has to look at. It seems that you haven't evaluated all the possibilties.
True, most users do not read the fine print- and get themselves in a world of trouble for not doing so. Yet, a wise developer will eliminate these possible problems before they come to a head. Not simply say "well if they break it, its their fault". This is one area that could be improved.
Also, package installers are not good enough. If I can be in control of where I put a new install, I would much rather do that than have the process automated for me, unbeknownst to what was installed, and where.
Another thing you have to consider is the timing of this venture. Adium X is on the eve of a major release. Surely you realize that at this time this can only afford to complicate matters, rather than help them.
If you are still wanting to proceed forward, I suggest some sort of easily readable "unofficial" disclaimer. The average user doesn't know http://www.adiumx.com/
. You must make it known that you are in no way affiliated with the "official" development fork- that this is a personal venture, and thus, all feedback/ bugs in regards to your build must be directed to you, and only you.
You have to make it known that the developers at http://www.adiumx.com/
are not to be held responsible for your build obtained at your page, nor any of your work/ modifications. This should be in bold print of some sort immediately above your "Download" icon. It is generally not good practice to put important information such as this on a lower part of the page, where a user would have to scroll to read it. Because, as we all know, chances are good that they will never even get that far. Where you have the term "AdiumX" in your forums, there is no mention that this is the "AdiumX Compiled by Derf" version. Yes, you have this at the top of the page, but then again, you also have a link to the official Adium X forum at Cocoaforge. I suggest removing the link to the "official Adium forums" in your forum, and renaming every mention of AdiumX on your forum page to signify that it is the "AdiumX Compiled by Derf". Otherwise, this can only lead to confusing users.
Adium X is definitely open source, Derf. But, if you're going to step into the open source/ public distribution fold and exist happily- conventions must be followed, or the community suffers as a whole.