I wrote an email about this a while ago and got a response back that it's something they would like to maybe do but they needed more interest in the idea before they devote time to it.
I'm not sure if this is for the other mobile apps too but I know my adroid app doesn't have this. Basically, there are a few music apps (not sure if I can mention the name but one I used to use a lot with the initials W.A.) out there that have check box in settings that lets the app use the headset/headphones to control play, pause, skip, etc. instead of controlling the phone.
Right now, if I try to use the controls on my headphones to play, pause, or skip while in the Spotify app it will simultaneously dial the last incoming or out going number in my phone.
It's just handy, especially in the winter so I don't have to haul my phone out of my pocket or dig in my bag for it, I don't have to haul off my gloves, mittens, or go buy special ones to use the touchscreen (I would imagine it would be a pain if your exercising or something like that too)...only have to click one of the buttons on my headphones.
Your idea has been submitted a while ago but unfortunately hasn't gathered enough kudos (50 per year). In order to keep an overview of the active & recent ideas in this forum, we will close this idea for now. However this does not mean that your idea has been declined by Spotify.
If you still feel strongly about your request, we encourage you to post your idea in a little different form again! Maybe now is the right time to receive the support of our community for your suggestion! 😉
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Edit (@blake) 2015-11-22: This idea has been reposted here.