The limitations of 360 seconds before the creation of a new post are only to avoid SPAM.
After getting 15 activities, this number will be reduced to 65 and so on based on this formulation:
if(activity >= 15)
waittime = (int)(90 - activity);
if(activity >= 60)
waittime=(int)(34.7586 - (0.0793103 * activity));
if(activity >= 100)
waittime = max((int)(14-(activity/50)), 4);
you can buy it from https://bitcointalk.org/index.php?action=credit;promote.
buying copper membership will add you to Whitelisting but remember it’s not a license to spam (you will be banned)