This question probably demonstrates my noobiness, but I know this is the best place to ask. I am currently using Shimano SPD m540 clipless pedals. I'm curious if anyone knows of a platform pedal attachment that might be available for Shimano pedals? Basically, what I'm looking for is essentially a regular platform pedal that has a cleat built into it that would allow me to keep the clipless pedals on my MTB but ride without using MTB shoes... I'm interested in something like this so I can use my bike for quick trips around the neighborhood, to the store, etc. and not have to wear my MTB shoes. Anyone have any suggestions?