I don't see how these could start rubbing the paint off the buttons. It's a snug fit, but there's a good amount of room between the headphones and the cover.
I doubt you could fit a 6' cable in there. It's already a pretty tight fit with just the headphones and its cable. You can, however, fit a small portable amp in that space as I have shown in the picture.
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Grado SR-325i, Yuin G2A, Audio-Technica ATH-ES7, JVC Victor FXC50
[Sansa Fuze/Clip > LOD] > PA2V2/FiiO e5 | ThinkPad > HifiMAN EF2
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