1) Sadly its not truly rock/paper/scissors but a pseudo one where lag means you have some timing to cancle it, The stun times are a relic of the past when melee was over the board (genraly due to JPA fist apoclyspe) so they were lengthened to give others a chance, they did shorten it a little bit but not as much as they should have. Sadly the devs are busy with other things atm to relook at it. 2) Rolling-i frames can work a bit aginst range but it dose not las long enoufgh to be anywhere effective. Like if the enemy has burst fire and shoots then with right timing you can negate his 1st brust but by the time you are ready for another he has allredy shot his 2nd burst and his 3rd is ready to go. Its useless for full auto tho. As for the timing i never realied on them so i cant tell you. 3) When they start that best bet is to back peddle and shoot them/ wait for them to use up all their stam. Even starting to back peddle will force them to attack or roll towards you which you can use to be prepared to attack them. 4) On a 1v1 it depends on your weapons and load out. They can be stunned trough their shield with a dbash and thats the best way to take them out. Other wise its to wear them down or get behind him as much as you can (its all down to skill) but as the game usually aint 1v1 its to stall him until you get backup. Also Power fist's rock aginst their shield. Sadly you will notice a lot of lore violations to make the game balance or because GW will not approve putting the item in the game (they have a say in if a item can be put in the game or not and GW cares not about quality or fidelity) or the dev teams do not have the liscine to put said thing in game (they do not have the lisince to put in boarding shields and other things) 5) If you press the middle mouse (default key) for auto aim then a red circle appers indicating you have locked onto the enemy. Normal pistols will lock on until you fire the 1st shot and then the auto lock disenganes. With smart weapons the auto lock will stay on until you manually stop it your self. All pistols can lock on for their 1st shot but only pistols designated "smart" will keep their lock on even after the 1st shot. 6) Pistol use is to your discretion. I use it when a enemy is trying to fall back or when i have stunned a enemy and then aim at their heads or when the enemy is locked in a dbash but they have mis calculated the range and their dbash dose not connect (then i punish them to the pistol) or when its too messy/dangerous to get into melee but i still want to contribute. The damage stays consistent no matter what you do (unless head shots or shots to the back) and it only aims at the head areas if you auto aim (here is hint dont do this as the shots can varry widely and its better to just manually aim your self) 7) What to do in combat is very fluid as it depends on too many factors. In melee beside out rps i try to make sure i am not being out numbered by the enemy by more then 2v1 as it takes a lot of luck and skill to win a 3v1. rolling behind in melee is very helpful and rolling when against range can be helpfull but only if you have enough range (close the distance enough) that your roll will put to behind or to the side of the enemy who will either FA forewoards and leave self open or Dbash and leave self open (better players will back peddle while shooting so it can be dangerous unless you have suffincet backup and cover to keep up against the foe) 8) Sorry for long number formats. Also english aint my 1st lang so sorry if its hard for you to understand.