Previously mentioned TwistC as doing hardware testing before I discovered that testers aren't supposed to be listed here. However, the truth is that they actually designed the hack and decided which buttons should go where (which I then implemented).
Here is a complete level hack for Rockman 5. All the levels have been changed and some graphics as well. This patch is intended for Rockman 5. If you plan to apply this to a Mega Man V ROM, please be aware of risks.