There's a few that should be discussed with the module maintainers first.  A patch for IDLE should go through Terry Reedy.  The "java.lang" in platform isn't a normal import and may have something to do with Jython.  The "abc" in typing.py might be there for a reason, so ask Guido before zapping it.  It's also possible that "encodings" might be in codecs for a reason as well, but I'm not sure who you should check with. 

I'm not sure about readline, rlcompleter, sitecustomize, and usercustomize. I think think those imports may be there for their side-effects.  Just importing them may suffice to enable some behavior, so be careful with these.