Fixing the seal and replacing the shoes would be ideal, but I'm try to find a temporary fix until the proper repair is done. So adjusting the brakes would not help, unless I am incorrect. But there must be something that could be sprayed into the drum that would decrease friction. Graphite power, silicone lubricant, grease, water, or? The brake grabs badly when cold, and locks up. Also drags for a bit, pulling the rig to the left until the brake warms up a bit. I wonder if siping, or cutting groves in the brake shoe would help - thus reducing the surface area of the shoe that makes contact with the drum
need to see your drum brake to be able to advise
If you dont want self-energizing behavior, depending on the drum you can remove the adjuster and the self-adjustment mechanism.... this means the brake wont self--energize, and will only brake with your applied pressure..
but thats not really that ideal. Esp without seeing your setup. you could remove your parking brake link that moves both shoes when you use your parking brake, and use that pedal to wear one shoe that would release when you let off
You could also leave the adjuster, but then adjust the shoes outward, such they dont apply until much more travel of your pedal, which would reduce them being as grabby, and may prevent them from cranking to be locked....
You could also use your shifter to downshift (auto) and rely on engine braking much more.
you could flatly remove the rear circuit fluid, and run your front brakes. this is NOT ideal and is NOT safe esp if you are braking down a hill or moving any thing like cargo. also will be less safe in bad weather.
You also would have your tires attempt to spin while at stop signs if you have an automatic.
None of these are ideal, or safe. But its answering what you were asking.
The real solution is to fix the leak, and you may be able to reuse your shoes if you blast them dry and clean of fluid.
No you SHOULD NOT use a lubricant on the shoes-drum interface , and the shoes will just become grabby again
Using something to lurbricate that might cause a fire