You're vague. I'm going to give you the answer since I've left you waiting for nearly two weeks and don't want to waste more time.
In the first two scenarios you are bound by the RoE corresponding to the rank of your opponent.
The first scenario with jutsu A you are dealing with an opponent equal in rank. You can only use techniques A-rank and below for the first three turns of the jutsu. Once three turns has transpired, you have full autonomy over their body and can perform techniques of any rank within restriction.
The second scenario with jutsu B you are dealing with an opponent lower ranked than you. Since there is no specified restriction you have two potential restrictions. If the opponent is 1 rank below you, you can only use S-rank and below techniques. Likewise, you can only make your opponent use S-rank and below techniques. If you are dealing with an opponent 2 ranks or more below you, then you have full autonomy. Remember, however, that in the first case this restriction is only for the first three turns. After three turns of holding your opponent you gain full control.
With the third scenario you're almost completely correct. The one restriction that is set in stone regardless of what rank your opponent is, is that you cannot use techniques above B-rank. Since your opponent, in this case, is higher ranked than you. You can only make them do physical actions. Since I was vague in that regard what I mean by "physical actions" was freeform taijutsu or non-chakra taijutsu techniques. Equal rank to you, you'd be able to use A-rank and below and if they were lower ranked than you, you'd gain full control.
There are a few things to note with the last jutsu and scenario as well. The first thing to note is that in the jutsu I gave specific circumstances for each rank your opponent was relative to your own without a time limit. What This means is, no matter how long the jutsu transpires, you can only perform the actions and jutsu. The three turn rule in the RoE does not come into play. Secondly, where you normally have two considerations for lower ranked opponents (1 rank below and 2+ ranks below) in the RoE, you only have one standard for this technique. Any member below you is basically your ***** until they break.
Does all of this make sense?
Do you have any follow up questions?