Currently, Stinging Nettle is a talent that makes your Mongoose Bite and fire traps apply your highest rank of Serpent Sting for 40% of its duration, for free and without resist checks.
It's a cool talent but there is one issue/gripe, the Serpent Sting overwrites any other sting you may have on the target, which can be a pain. Granted, Survival is close-range oriented, so I guess the expectation is that you won't be applying stings very much as survival, but it would be nice to have the option of using Scorpid Sting or Viper Sting without having to drop Stinging Nettle.
I have 2 potential fixes
1. Make Stinging Nettle unable to overwrite Viper/Scorpid stings, but ofcourse allow it to still overwrite/refresh Serpent Sting.
2. Make Stinging Nettle refresh any active sting at 40% of its duration, if you have a sting on the target already. If no sting is active, it works as normal(40% of a max rank serpent sting).