this would be a glass cutting tool that would allow you to click on glass panes (would use durability) and change the pane from a "rod" (1.9) to the original pane shape of a "cross" (1.8) this would reopen many building opportunity's. and make people who like rods and people who like crosses happy
this tool could have many other uses as well. feel free to drop ideas on this tread
other possible uses: using on panes would make them either connect to blocks or disconnect from blocks.
ideas for crafting: shears and sticks? i don't really have any good ideas for crafting recipes but having shears involved makes sense...because cutting...idk..
you would be able to enchant this with unbreaking 3/mending