I know that there are people around, that want to get WB further - and I think Daniel also wants to do that. I know about his site, and well - I don't think it's such a bad idea have an "alternative" site.
But there is one problem: Such effort is not directly linked with the Core Development and all the offers on "the Core site" WebsiteBaker.org.
Please don't get my wrong: All big software have alternative support forums and Community sites, and I think that's not bad. Mostly it's because the main forum don't offer the language, but also it's because not everybody is that satisfied with the "core sites".
There's only one problem: This all has to stay private. We have yet built teams here to get a good workflow, concentrate on the main things.
Just look here: http://start.websitebaker2.org/en/teams.php
(And using Whois http://www.whois.net/whois/websitebaker2.org
or the Legal Notice you know who's behind it).
It's a much bigger change at the work on WB as most people think at the first glance - I speak from the people that know the time before, where Ryan was the leader of WB. But there is no Ryan anymore and there will be no Ryan in future. That times are past, in quite every aspect.
The problem about offering something for the Core: The people working in the Core Dev Team know WB, and they work with WB. They have many things in mind that they want to do - to achieve getting WB on a more professional, better level.
When somebody from outside offering anything for the Core it's always a problem to use it directly.
There were things from the community that were integrated in SVN - e.g. that one: http://project.websitebaker2.org/ticket/821
But there were also things, that were not implemented and won't be, even if there is a working code available.
The thing here directly with the installer: As I said, the Dev Team is working on a completly new one. It is not yet in the SVN - and I think only working things should be uploaded to the SVN. When it's ready - or if it will be finished with 2.8.1 - I just don't know. Contact here LordDarkman or the team leader aldus, they should know it. But don't be disappointed when they wont say too much.
You said Joomla here. But you know, that also Joomla Devs don't always do what the most people want to achieve (e.g. think of the User Access Rights, there were some working mods out there for 1.0.x). Such a big software - like Joomla, or like WebsiteBaker (yes, WebsiteBaker is big, >5000 downloads every month, several 100.000 installations, page rank and alexa you know) - has to decide. For or against.
When you want to contribute - there is a form here: http://start.websitebaker2.org/de/mitglied-werden.php?lang=DE
(I took the German one).
But keep in mind: That are teams, you will have a team leader, and the team leader has to board (German: Vereinsvorstand). The board decides about "the big things", the team leader "about the smaller things". You will have tasks, you will have deadlines, you will have to do things that aren't 100% the things you prefer to do - or you prefer the way doing it.