Remember this: Practice does not make Perfect, it makes PERMANENT!
It pays to frequently re-evaluate your firearm habits to make sure they are not detrimental to REALISTIC FIREARMS TRAINING.
For me, I was trained early on to NEVER use my slide release lever and ALWAYS use the SLINGSHOT method to CHARGE the Pistol.
In the Event of having to manipulate the weapon one-handed, the slingshot can be done using the heel of your shoe/ boot.
Bottom line, which ever way you choose, slide release or slingshot, TRAIN that way ALL THE TIME! Repetition builds muscle memory.