I don't understand this: "We really shouldn't be distributing them as an official thing for a stable release update when the original release in question didn't have them." And don't even worry about explaining. I'm sure it's a "developer thing". My point is that most users probably don't understand it either. And more importantly, that users should have access to all versions of Inkscape, from a single source. And since inkscape.org serves users and devs alike, it makes sense to me that all the versions should be linked -- at least from the same site, if not the same page. It seems reasonable to me that a link to the 64-bit version could be in a separate paragraph, perhaps even titled "unofficial version" if such a distinction is necessary. In my experience, I think most users would expect to find it with all the other versions, and would be surprised not to find it.
Re: "Are people willing to deal with 64bit build specific issues in a timely fashion?" I should explain that I don't understand much about trunks and branches and forks and builds (I really only had to join the mailing list to get edit access to the wiki). But it was my understanding that the 64-bit version was identical to the 32-bit version, except for being multi-threaded. And again, please don't feel obligated to explain, because I know you're busy. It's just that based on my simplistic understanding -- how many 64-bit specific issues could there be?
And again, please don't take the time to reply to me — I would only ask you to consider my comments.