Our club is in Illinois and like yours no restrictions on whether you stand or sit. Some guys always stand, some almost always sit, one guy is 95!, and some do both. I usually stand to take off and land and then sit during the flight. We have no problems with sharing pins or airtime. We found alot of guys do better once they try sitting, older flyers have more balance issues when standing for longer periods. Had one pilot who had an inner ear problem and would fall over if he looked up for too long, he would not try to fly sitting down, so he only flew with another competent pilot by his side, it worked out fine and he recovered from his medical problem. Whole point is to help each other and have fun.