I do wonder why they never added the locking, I suppose to prevent visual clutter for teammates but then they could just make a toggle to enable the locking individually (a person could only ping 1 gadget at a time anyway).
The new Rainbow Six: Siege gadget pinging system seems pretty close to finished!
- You can ping enemy & friendly gadgets
- Enemy gadgets show up as red, friendly as blue
- You can lock onto a gadget (so it doesn't dissapear)
- Crosshair appears in center