After a few weeks of jump flying recently(nice break from mail bags and Alpha Bravos Oscars)In a controll zone I didnt get one single delay,The guys in the tower did a fine job of keeping all the turboprops and 737s away.
How it worked for us was airways clearance was issued from the tower to whatever height required in the dropzone,which happened to be right over the township 3 miles from the field.
On reaching jump height I would make a all stations call to melb centre and then obtain a clearance to drop and decend from the tower even though I was above the upper controll limit for the airport.They would clear me on a visual approach and the rest is history.
Uncomon sense,
If you are clear to ,DROP,DECEND.CLIMB,LAND.TAKEOFF.JOIN CICUIT,TAXI.Then thats what you do.
If ATC wont issue a clearance to drop well you dont drop.Just like any clearance denied.What would a IFR rpt ac be doing in a DZ???