More than that, there should be more support for software tweaks, like changing the reasons for closure votes, changing the time limit for editing comments, changing the time limit for changing votes, changing the number of required votes to close, changing the character limit or the minimum number of characters to post in a comment, skipping the CAPTCHA screens for users with high rep, and automatically escaping text inside of $ delimiters. These things are all possible with OSQA (or another OSS solution). Right now, the only feature MO stands to really gain from SE2.0 is comment editing, but there are a lot of other changes that are annoying, many of which are [status-bydesign].
SE inc has a "one size fits all" mindset with regards to the software, which I find extremely annoying, especially when people from SO proclaim things about the software as though they were divine revelations from up on high, when they're just opinions from the latest blog post by Jeff Atwood. I'm also afraid that certain SO policies will overrule MO policies, for example, the policy on posting links to copyrighted material. I think that MO should maintain itself as a separate entity from SO, that is not as a part of the SE2.0 network. Right now, MO is a site by mathematicians for mathematicians (albeit running third-party software), but if it joins the SE2.0 network, SE inc will have the final say over how things work. SE inc's role changes from providing a service to administration.
It's not worth giving up our "national identity" for the ability to edit comments.
]]>In the meantime the software isn't going to change, but you do have access to the database dumps at http://dumps.mathoverflow.net/, which should suffice for anything that doesn't need up-to-the-minute data.
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