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No, they don't allow spreads at all. Here is what IB allows: https://www.interactivebrokers.ca/en/index.php?f=13406&p=rsp

@J_D Hi, sadly not many alternatives to ONE. The other software is Optionvue (https://optionvue.com/) but I have never used it so don't know how good it is. I've gotten used to ONE now and mentally make as adjustment to the P/L chart which it shows me. For example, if I have a double calendar on the SPX say and the software is showing a profit of say 12% by the next day, I know in reality it will be more like 6-8%. Ideally, what would be great is if there was a software tool which would allow the volatilities of individual legs to be changed manually whilst we 'future-pace' a trade. I've even thought of hiring someone from Upwork to write me some nifty code to make this happen, but it's not high priority. For a static situation, it's not that difficult - even a VBA macro in Excel using the Black-Scholes model will be able to do this (but it won't be real-time). Good luck.