Doesn't this happen in warband? Can you give me your mod for testing?
I keep V Sync on by default and the particle effect doesn't look different than when the frame rate isn't being capped by the display. The double jump does feel a bit different whether I'm playing on VSync or Unlimited framerate as the offset is played out over 50 frames so the frame rate does affect how quickly you go up.
Double Jump Source Code, here.
and
Weapon Particle Visualization, here.
The zip for the build in the video demonstrating the v sync glitches.
The character creator is being overhauled, you need to select have an Education at the Church to get the item in the video. Either "Church-led" option will work.
To assign a the double jump spell you need to be on the main map, right click your party, click assign spell slots, exit that presentation, go back into it so the formatting gets fixed, then under wind spells select "Air Jump". It does not have an icon, but there is a tool tip.
Pressing 'm' in a scene will let you assign your active spell, and middle mouse button fires it.
It's all extremely unpolished, sorry.
I also noticed this difference AGES ago, but didn't want to report it since I can just add a
(is_vanilla_warband),
to stop the rotation, but, the rotation in
this script behaves differently in WSE2 than in Native. But knowing that it behaves differently might be important.