Hi,
I haven't heard of anything for Webstorm yet. The library of plugins seems to exist here -JetBrains WebStorm Plugin Repository. If there isn't anything out there that satisfies then why don't we create an opensource plugin?
I haven't had any issues with UI5 development in Webstorm though. The areas that could use a bit of improvement however could be something to help with view creation, XML etc.? That would be on my wishlist.
Oli