7) ie. MAE/MFE, Sharpe, Drawdowns. Your volume profile features are going to attract a lot of day traders. These people want to see trading performance stats much similar to NT and S4? S6? trading. Portfolio traders want a different set of metrics altogether.
8) Chat within the platform with other traders. CME allows you to actually copy and paste a deal for viewing through chat. So, other traders can get the link and take action.
Just some ideas. Your platform is overly ambitious and I mean that as a compliment. You will have enough fires to put out as the application comes under scrutiny from the market. Applications with this breadth usually have the backing of deep pockets with a full bench of talent. I would recommend you take the Walmart approach and get market share fast thru aggressive pricing. Take a queue from Tradeovate (the CEO founded EOC Futures and is a trailblazer in the industry).
That's my 2c.