Specifically, I would like to see Sierra Chart integration. This would allow me to use my custom indicators including volume profile. MT4/MT5 is not an option and if I was going to use these I would move from IG.
I know some of the history of Sierra and IG Global (Circa 2015). Perhaps a relationship between Sierra Chart and IG US could be fostered. Although, I do not know what the business case for the relationship is.