As of v1.0a, vanilla should not always consume rope except for a couple of overlooked cases: when the player uses teleport stones and when the player ends sex with ropes still on slaves. These will both be fixed in 1.0b, which will be completed sometime this week, not sure when it will be released.
As Ank said it should be fixed soon in the base game and it didn't make a lot of sense for the mod to do work that the base game was already doing which why I removed the rope reusage stuff in this recent version.
