Personally I would not worry about the pedaling and get your little ones onto a balance bike (or run bike). The hardest thing to learn on a bike is balance - once you have mastered that then pedaling is the easy bit. Little kids often don't have the leg strength to pedal, especially on hills.
DP put a video together on this FB page called "Why a runbike?" so check out DD1 on her journey to riding a 2-wheeler with no training wheels when she was still 3 - he has put in heaps of information on the sorts of bikes and reviews etc there too. Welcome to Facebook
DD1 has been able to pedal from about 2 years of age. She has a bike with training wheels, and we've just raised the training wheels a little recently so she's not so dependent on them, and she's doing really well. A friend of hers who is the same age got a bike (with training wheels) for christmas and she still can't pedal. They practice with her every day, but she can't get the hang of it. All kids are different, some pick it up real quick, others don't.
My Ds caught on to peddalling a trike around his 2nd birthday and can ride his friend's bike that has no brakes (since pedalling backwards does not stop the bike). He has his own bike with pedal brakes that he is not able to pedal yet, as he can't figure out only pedalling forwards. He didn't like his friends' balance bike very much.
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