I use optest tool it very very use full tool for very one, but there some issue what i found while doing testing.
My concerns is only for Custom positional only because i'm positional traders.

1. If we have a strategy like option and future mix than there is no option to add legs suppose i need (2 future short and 2 call long otm and 5 put short otm) this is delta strategy but i can't able to check it.
2. if we have a strategy where we need to play in 2 expiries than we can make it suppose i need (2 future short and 2 call long otm (next month) and 5 put short otm (current month)) this is also not possible.
3. some times we need a option chain suppose we have a strategy like based on premium and strike price both than we have no option because of premium and strike price will be vary according to IV.

My suggestion

1. Please add option chain to select legs along with future option
   2 .Please add leg wise expiry