Hey Nofish, if you start shooting docks you're going to have to change your name
I learned the technique about three years ago and it is my go to method for fishing for crappie other than during the cold months of winter. I use a Wally Mashall 5'-6" UL or a B&M sharp shooter ($28.00 at Grizzly Jig CO online). I like the SOS 4#test line and shoot 1/16 oz jigs. The biggest plus shooting docks is I can get to spots you can't fish tightlining. If there is a pontoon boat in a slip I shoot under the boat between the motor and pontoon to the from of the boat then let the jig drift down or start my retrieve with a count down. I even shoot up under boat lifts. I started shooting about three years ago and it took a good day of fishing to figure out what worked best for me. With the sharp shooter rod I hold the rod parrallel to the water, with the Wally I point the rod slightly up. I would be glad to hook up with you some Saturday or Sunday afternoon, just PM me, once you get use to it, you will be shooting up under brush and laydowns and looking at holes between float dock and water 4" big and when you hit it just right, you will find a grin on your face or better yet a big slab in the boat.
Have a great day,
Ray