BEWARE!!!
Your initial idea is right to 'not be a restaurant'. Lite sandwiches are ok, pastries are ok, but stay away from soup. Friendly cautionary advice. You don't want customers to ever smell soup when they walk in your place, it should be coffee, or fresh pastries, or more coffee.
Make customers feel included, but I would steer clear of entertaining any of their wants, suggestions, etc. There are reasons why you chose to do X when you started, you create an identity based on your desires, location, cost factors, quality, etc.; you create this identity as a 'coffee shop'. Don't blur the identity. Food is more costly, more wasteful, less profit margin, and ultimately it kills your identity. Keep it light. No soup. Soup starts to mean 'cafe' with one 'f' as in 'diner' rather than 'caffe' with two 'f' meaning coffee/coffee bar. There is a huge distinction. Decide which path you want to take for yourself, but should you blur the line, don't fool yourself into thinking you are one and not the other.
Often many new owners are afraid to take charge of their business because they always had to answer to someone else and they haven't overcome that mode of thinking. Customers mean well, but there's a reason why you're on the business side of the counter. Remember, it's your hard earned money, sweat, dedication, and passion. You have to do what's right for your business long term. Make decisions that improve quality, maintain identity, and grow (long term) profits.
My 3 cents (inflation and all...)