Setqueststatus [quest name (variable)] [value (tag)]
The command should set the state of any open (running or journal accepted (listed?) quest to one of the following conditions....
1. open
2. close
3. run
4. cancel
5. fail
6. succeed
Not very sure as i havn't played with them, you would first need the quests name then try experimenting.
There are several separated "Inquisitor" quest states for the tunnel --->
Inquisitor_FollowMe_01
Inquisitor_FollowMe_02
Inquisitor_FollowMe_03
Inquisitor_FollowMe_04
Inquisitor_GatherRaidingParty
Inquisitor_GoToAltarDoor
Inquisitor_GoToBreakthrough
Inquisitor_GoToPortalLock
Inquisitor_Initiation
Inquisitor_MagicSupport
Inquisitor_OpenDrawBridge
Inquisitor_OpenMaingate
Inquisitor_OpenPortal
Example: --> setqueststatus Inquisitor_FollowMe_01 cancel
....good luck!