How to pass additional parameters in the password field?

Some pools, e.g. zpool allow to define additional mining settings in the password field. See an example below:

BMiner.exe -api 127.0.0.1:1880 -uri stratum://1GSq8txFsg1je6yL8t6S94mYdF8cGqVQJF:BLACKBOX,c=BTC@equihash.mine.zpool.ca:2142 -devices 0

Bminer throws an error:

invalid value "stratum://1GSq8txFsg1je6yL8t6S94mYdF8cGqVQJF:BLACKBOX,c=BTC@equihash.mine.zpool.ca:2142" for flag -uri: Invalid port in the URI
Bminer: When Crypto-mining Made Fast (v7.0.0-9c7291b)