CPS callback functions

Did anyone ever mess around with the CPS perms? Did anyone of you ever try to replace the existing change proposal system by your own using the below perms?
 

void addCPSCallbacks4 (bool dxlFnGetUserKeyDOORSnetGuest(Skip), bool dxlFnGetCPSEMailUpdates(), void dxlFnStartDOORSnetCPS(Skip), int dxlFnGetStapleCount(Skip), int dxlFnGetCPCount(Skip))
void addCPSCallbacks1 (string dxlFnGetUserCPRole(Skip), bool dxlFnSubmitChangeSuggestion(Skip), Module dxlFnOpenModule(Skip), void dxlFnCloseModule(Skip), string dxlFnGetCPTargetPath(Skip))
void addCPSCallbacks5 (int dxlFnGetConfiguredAttributes(Skip), bool dxlFnGetLinkToSource(Skip), void dxlFnTranslateChangeType(Skip), bool dxlFnSubmitChangeProposal(Skip))
void addCPSCallbacks3 (void dxlFnFilterOnStapleSet(Skip), Object dxlFnGetUserSection(Skip), bool dxlFnStartCPEdit(Skip), void dxlFnStopCPEdit(Skip))
void addCPSCallbacks2 (void dxlFnFilterOnObject(Skip), Object dxlFnGetStapled(Skip), string dxlFnGetSourcePath(Skip), string dxlFnGetCPIdentifier(Skip))

Regards, Mathias