Hey SMOC. Whoever told you this little known fact is spot on! Whilst ST has explained the ramifications from a starters point of view, there is one other function that happens when the switches go to Ground Start. On the RR engines the FMV in the FFR is cycled to the low speed stop everytime start is selected. It is only a momentary cycle, however is enough to run an operating engine down to idle for a brief moment. Scary if all 4 are done at once, such as entering icing conditions.