The automatic opening after 3 seconds only happens if you're hovering on either the Icon, the Info button, or the actual text that says read more. It doesn't open hovering anywhere else.
The template authors dictate that. If you go to Statistics, then click Repositories you'll get a popup with every single GitHub URL I'm using and you can issue appropriate pull requests against each and every template present
Probably not going to happen, but you do realize that after a search you can click the category on the left to narrow the search down to that specific category