UPDATE: I spoke to a Permit Specialist at Cart Baron. She checked first with the Chief Ranger, who thought it would not be allowable to use the parking lot in this way. However, she then spoke to Park Police, who she said are the ones patrolling the lot. She said Park Police told her there is no restriction on how long one parks in the lot, nor on how often on parks there, except that overnight parking is prohibited. She indicated she would relay this back to the Chief Ranger and let me know if he were to disagree. However, she warned that if too many people were to start using the lot for bike commuting, the policy would likely change. So I post this information with some trepidation, but in the spirit of openness. 