Accurate Attack v1_2-23746 works on OpenMW.
https://www.nexusmods.com/morrowind/mods/23746
What else combat mod do you know that works?
Better Balanced Combat - I recommend this mod. Unlike the many combat mods for TES: III this one does not require any Script Extender or XE. It works with OpenMW and allows on hit landing removing the hit dice rolls.
https://www.nexusmods.com/morrowind/mods/46596