It bugs the crap out of me that they don't integrate with other services like Mint. Right now I do a few things. I manually track my position using personal capital (I can't recommend this service / app enough for tracking ALL of your investments and planning for your future). It is kind of like mint, but exclusively for your investments (https://www.personalcapital.com/)

I've written a fair bit of code (python) to parse my statements and make sure things true up with what personal capital says. The app thing is annoying, but RH just closed 110M and they'll get more functionality in the future. You're not the first person to ask that and I figure eventually they'll have to open things up or they'll lose customers (like me). Right now, I'm ok with using it for a year or two provided they allow me to continue no-fee trades.