Portals / Furnace

It would be great if they added the ability to change your portal type from the nether portal to a ender portal. There is a way to get around it but it is much more complicated. Maybe even make portal types that aren't in vanilla like the ability to change the size of the portals or the ability to have the frames be made from multiple blocks. Also make the ability to create custom-items with a smelting like GUI.