Toggle autoindexing with a keyboard shortcut

[BertMcMahan]

Autoindexing inputs and outputs is incredibly useful, but when it indexes and you don't want it to, you have to right click the tunnel, select Tunnel Mode, then Last Value.

Can we get an option to enable or disable autoindexing with a keyboard shortcut? Say, hold Shift to disable indexing, or tap Alt to toggle it.

A couple similar ideas:

Change tunnel mode with Ctrl-click 

Smart autocorrecting autoindexing (from 2009!!)

[wiebe@CARYA]

I like it. Esp. if you can select multiple tunnels, and use the key to switch them all (if you select all inputs or outputs).

Extra credit for switching conditional on and off.