Non-frictional redirect, maximizing pull in 3 positions, it is either on the load,anchor or pull:
1)Pulley on load, places 2x pull on it in pretightening, 1/2 as much stretch over single line on holding to compound that in keeping limb up. Being a 2/1 (or more) that much more line is needed in excess of the drop height. A 2/1 puts less load on an anchor than a 1/1 in lowering. Also in lifting, all your effort is almost without restriction.
2)Pulley on anchor as redirect in vertical lines places 2x load on anchor. Hanging pulley from a sling when it is a shared anchor will put more load on the other support anchor, the lower the original pulley is allowed to hang for dialling in how much load is where! If the other support anchor is frictional, this would also adjsut the amount of upper support friction, for less anchor loads, as control line would need less pull.
3)Pulley on Input force, dividing its pull in 1/2, thereby increasing speed of pull on load end 2x.
Pulleys aren't frictional so you can speed drop without melting the line. This will put less load on the support anchor also, as the system isn't holding back so much weight from gravity's pull.
Also, use them for steering, if don't have support anchor right over sweet spot on ground for delivery, put load in 2/1, with spread overhead supports equidistant from sweet spot that will make whole day easier.
Wider support on riding gravity bender (speedline), for less bend in line.
Then all the applications of original 3 placements, like 3/1 lowering with friction anchors, pretightening lines etc.