1. Broadcasting fetilizers around mast bearing trees and preffered browse.
If it's not legal it oughtta be. I know a buddy that swears you can give an old apple tree a whole new life with a sack of lime and a sack of 10-10-10 spread around the drip line.
2. Creating a isolated water hole in a prime location. I'm not sure the legalities of either of these two, but I wonder if you do not dig, but rather find a shallow depression, and line the bottom with plastic and cover it with dirt to create a lasting reservoir for run off, if it would be legal?
The digging is probably not allowed and I'd think you'd be hard pressed t find a spot that need water enough that you could create something that would alter a deers patterns. It'd also be a potential mosquito haven and maybe a haven for those nasty EHD carrying midges
3. Creating a scrape corridor, by tying down limbs in strategic places, and then treating the limb and soil beneath. Studies have shown the licking branch at preffered height is the most important factor.
I like it. I think the legality would be whether you actually damage live trees.
4. Planting apple or persimmon trees in remote locations. Pretty sure this would be illegal on public lands.
I think this can be done with the appropriate owner/ manager permission. I believe I've heard of groups like scouts etc making service projects out of stuff like this.
As far as the outfitters secret...... None of the above!