I added a "issue" to marlin here:
I doubt the retraction bug exists after looking quickly at the documentation as those are supposed to change the feedrate and then change it back. I think. Hell I don't know.
Sounds like a Marlin bug for both issues. Marlin should set flow back to 100% when changing filament (incidentally I don't use this anymore - I just pull it out by hand and shove in the new one - Robert taught me that trick).
Bug #2 is the G codes for retraction (G11, G10 or something like that) should take into account the current flow.
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