You are not researching multiple techs at once technically only Crop rotations is researching however upon its completion you will get the benefits form horse collar and heavy plow. But time is not lost when canceling upgrades if you were to cancel Crop rotations at 90% you would start researching Heavy plow which would instantly competition though you should have a 1S grace period so just so you can also cancel heavy plow if you want to, not that you should every cancel eco upgrades. However, if you were researching heavy plow at 90% and click Crop rotation it would take the full 70S and you would not receive the benefits of heavy plow until Crop rotation is complete then. Otherwise with Burgundians you could start researching Cavalier in castle age and click Paladin upon reaching imperial to have near instant paladins.
How about no to your upgrade skipping. Its quite clear people are against it.
I think still think it is an interesting idea and as long as someone is here to argue with me, unless I have something better to do, I will be here. Still even if this idea was popular there is a slim chance that a dev would even see my post nevermind actually implement my idea. Nothing we say here matters all we are doing is arguing with each other whether it is because of boredom, our Egos’s, or our infinite quest internet points.