As a member of the 'obvious recue team', and a member of the Ops group for said team, I can tell you that any permanent rigging or aids we fit are always done in consultation with CNCC or, above ground, the BMC and other interested parties. These steps have never been discussed or sanctioned by the teams Ops group.
On some rescues, we need to rig extra hangers or bolts, which are then either made good or referred to CNCC to see if they will allow them to remain.
Believe it or not, we do try not to damage the cave environment.