First don't be concerned the 40 Shield has TOO MUCH recoil, as it does not. Sure it has more recoil than a 9mm, as the 40 is a more powerful cartridge. I carry and shoot the Shield 40 and find the felt recoil and flip to be just slightly more than the 9mm, and for me the little extra recoil is well worth it for the more powerful caliber. It might take me 1/4 to 1/2 second longer to get back on target for subsequent shots, compared to the 9mm.
Second this is a striker fired gun, and as such it is just like a cocked and loaded 1911. The safety is a personal preference, but if you should carry in any way that the trigger is not completely covered, then a safety might be advisable. I pocket carry my Shield 40 with no holster and I carry with the safety always on, as I would not want to reach into my pocket and accidentally pull the trigger while pulling the gun out of my pocket. That would not be a good thing. As I draw the gun, the safety is swiped off as the muzzle starts to rise, so there is no delay if I needed to shoot.
Bob