I wanted to either vote to close or flag https://academia.stackexchange.com/questions/11360/form-get-method-prints-viewstate-value-in-addressbar as suitable for SO.SE, but I could only suggest it belongs on ac.meta.se (which it doesn't). If something belongs on another SE site how do I vote to close for that reason?
It is quite counter-intuitive, but here is how it should be done:
As you noted, the “belongs on another SE site” only lists a few pre-determined sites (which we can ask the moderators to complement if we wish). Everything else is “other”.
Mods have the option to send it to any other site. Flag it and we'll send it there.