As far as I'm concerned QC doesn't allow the custom orders defined by Bitfinex as "OCO: Order Cancels Order"

I'm wondering if there's any plan to implement it in the future.

Also, a non-related issue, is that I would like to know the list of symbols we can trade because i.e. symbols with 7 letters throw an error, and other symbols simply don't retrieve any data from the exchange, maybe these are bugs, or defined by default, I would like to know.

Thanks for your support,

Best Regards,