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Auto Row Boat

Press Hotkey, and your character will automatically row the boat to follow your cursor direction.
Normal "rowing once" action with right mouse button can still be performed.

You can also check this excellent mod:
Auto Rowing (Updated)
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2836299735
The way it rows the boat is somewhat different. You can use whichever you like.