I use zecco and scottrade my BUDDY uses Scottrade and Ameritrade
zecco is great for thos Stubbern ones ST dosnt allow you to buy. ALTHO zecco is MUCH slower. you can also use different trading methods with ST that Zecco dosnt allow.
The 5th digit trading dosnt speed up your order at all. it still sells at the SAME time frame it owuld have sold at .0003 just the broer got a lil better deal is all.
tested this with placing 2 order at same time in for sale. one 5th digit low and the other a standard 4 digit. the 4 went before the 5th digit.