Smart quote functionality in the post form
Concept
This would be both very convenient and very weird:
Unlike the real Tumblr tags input, the Quick Tags input converts doublequote characters into "smart" quotes, so that they can be part of the tag instead of doing very strange things. This is extremely useful, but the only way to do this from the post form itself is to draft the post, go to your drafts, add the rest of your tags with quick tags, then post the post.
My first proposed solution to this is an option for Quick Tags to just continue to show the text input form in the Quick Tags box in the post form. Of course, this sounds completely nuts unless the user realizes that this quotes functionality even exists, but it would at least be easy.
My second proposed solution to this is to add this smart-quotes functionality to the post form itself. I bet this is possible, either automatically or with a button in the tags area. With some clever code, it should even be possible to make the button only appear if one of the user's entered tags contains a quote character, at which point quite frankly the button could be pretty intrusive because submitting the post form with quote characters in the tag is effectively triggering a bug. Honestly, my main issue is that I don't know where this would go. Tweaks?
(I'm also going to support-form the current behavior as a bug, but I think it does make sense for "replace the quote characters with something else" to be an XKit-specific solution. Unless Tumblr's back end can be made to just support quote characters, of course. Otherwise I assume Tumblr-side solutions would just be to add a warning message or split the tag on quote characters.)
input: #this is a tag with "an embedded quotation" that continues afterward
tumblr: #an embedded quotation #this is a tag with that continues afterward
xkit: #this is a tag with “an embedded quotation” that continues afterward