Pressing the middle mouse button toggles a pin on the "closest entity"
selector. The HUD will indicate the lock by showing "pinned" instead of
"closest" entity. All actions, that would otherwise affect the closest
entity, will affect the pinned entity instead. Deleting the locked entity
will unlock it.
toggleclosestentpin
Toggles the pin on the "closest ent" selector. Bound to MOUSE3
by default.
DOCREF togglelockclosestent