Most 'sit down' restaurants have a baked potato or at least the ones I've been at and most places I go have whole or skim milk.
We don't have a Friendly's here but you could try your petition. Have you called the corporate office and asked them about healthier options and what they'd require in number of signatures to add it?
mpaigew, ask for things the way you want them cooked and you can have 'exciting' options. It took a while for me to assert myself and tell them exactly the way I wanted it cooked but most places are very accomodating.