I don't quite follow.
Attaching wood at the end, then midline as many times as possible, then leave enough to lower without losing the tail, is one way to get more than one solo lowering of wood.
If you hitch slings (to a biner, to another sling girth hitched on wood) on to your rigging line, you don't have to unload the line to put in a midline knot for attaching your next piece.
I saw Reg hitch pieces onto a stationary rigging line in a video. I haven't done that, myself.
If blocking down a spar where you just need things to not bounce, you can just put on some wraps, and let it run, each time clove hitching over the next chunk to attach the line to the spar chunks.