See http://mod-buildcraft.com/forums/index.php?topic=625.msg6715#msg6715 and http://mod-buildcraft.com/forums/index.php?topic=641.msg6721#msg6721 . If these requires simple changes, that'll go in 6.0, otherwise it will be rescheduled for 6.1.

Possibly fixed with energy framework improvements in 6.1 branch.

I think this is closed with the RF rewrite of power pipes.