Having just come out of an alliance raid (Labyrinth of the Ancients) where an anonymous player was consistently and intentionally removing all waymarks to try and sabotage the run, it would be incredibly beneficial if we could have a waymark log message when they're placed or removed.

Tifa Lockhart sets Waymark A on the battlefield.
Aerith Gainsborough applies a Waymark Set to the battlefield.
Cloud Strife clears all set Waymarks from the battlefield.

This can help groups identify players who are attempting to troll them, as well as let folks know who is helping in a PF Group when they brought along their saved marks from earlier clears.