I am running into the same problem. Export an entire project the rule is in Editing status in the source project and also in Editing status in the target project. The Rule bindings have changed in the source, but I have 42 rules that won't import into the target due to rule binding changes or parameter changes. I agree, everything should be left in Editing status due to the issues with changing parameters and bindings once the rule is Approved.
This seems to be a product defect that needs a solution. BTW, we are on the latest version, SP and patch of IS.
Thanks for any assistance with this show-stopper.