Would it be possible to make waystones send a redstone signal when they're activated? So we can make some cool contraptions/tricks, like powering up some lights, moving blocks with pistons, etc.

It could also work if it triggers a "block has been changed", then we can use observers to send the signal when the waystone "changes". Not sure if that's possible at all, tho.

Observers will now fire whenever a waystone they observe is activated.