The Leylines button should just turn into the Between the Lines button whenever it's up.

I would also love it if Enochian/FireIV/BlizzardIV worked like they do in PvP and were just all the same button. Since you can effectively see Enochian's remaining cooldown based on the progress of the Foul bar, you don't need Enochian's icon to remain visible while Enochian itself is active.