in the AssetsIB.csv provided with Zorro installation we have the following line

AUD/USD,0.77311,0.00005,0,0,0.0001,2.2,0,33,25000,0.5,

commission = 0.5

on interactive brokers website I read the following

IBKR offers competitive commissions on Forex, starting at 0.20 basis point * trade value, with a minimum of 2.00 USD (or USD currency equivalent) per order.

Questions --
1) is your 0.5 just a made up value ?
2) how can I express the "0.20 basis point * trade value with a minimum of 2.00 USD" concept in asset list commission field ?

thanks