yeah, each broker seems to have small differences. I have had a few accounts with TD Ameritrade, but I can't remember how restrictive TD Ameritrade is for buying non-reporting pinksheet stocks.
I like brokers that are as lenient as possible with restrictions. (which is why I'm upset with Fidelity increasing it's restrictions on such stocks)
Schwab is rather good for allowing the purchase of risky stocks, and I have noticed they seem better than other brokers at getting fills at the ask when selling (if I wait long enough)
Many brokers just don't want pennystock traders.
Vanguard won't allow any purchase of any stock valued below $0.10 per share, same with WellsTrade.
Scottrade is terrible for pennystocks (and merging into TD Amertrade soon anyway)
Tradeking (er, um Ally Invest)terrible for pennystocks
so I'm down to mostly Fidelity, Schwab lately.