it would be cool if the hand crank output more RU/t if you had strength or haste, not by that much of course, i just think it would be a fun feature
also i might just be seeing things but the texture on the bottom of the active hand crank looks like its going backwards
Done both of those, also Villagers may or may not be able to operate them now.
Will this affect the techtree? And this could lead to non consumptive village slavery, which could affect the balance. Slavery is bad, is it?
Maybe the vilagers will form worker unions against you 
… Or maybe if you missuse them too much they will aggrevate iron golems against you, that would be quite funny. At first I thought maybe it could cause agrevated iron golems to spawn but then that could be used as an iron golem farm 
I sincerely doubt having a random alternative way to create a measly 16 RU/t would have any long standing repercussions on game balance 