As title says, there is a mod called Horizontal Glass Panes which already does it, but firstly it's out of date and secondly I think it's appropriate for Quark.

Closing all further suggestions as of now. Since quark is a mod for features that will go in vanilla, post your suggestions to /r/minecraftsuggestions and tag me (/u/vazkii) if you want me to see it. I take notes of all features I intend on adding.