https://www.curseforge.com/wow/addons/dialogkey
Adds the ability to bind a button (default: spacebar) that can accept popup dialogs, select quests at quest givers, complete quests, etc. when pressed.
Jed-Giblin/wow-dialogkey
Allows you to accept dialogs, progress quests, etc. with the spacebar in WoW
LuaGPL-3.0