It could be useful to run the HTML5 client in its own dedicated window, with most of the browser interface hidden etc. This is typically referred to as a "web application" mode. Unfortunately, support for this is spotty and varies between browsers and platforms. We already have some kind of support for this on IOS, but I'm not so sure about other platforms. Apparently, a JSON-based manifest is the way to go, but currently *only* supported by modern versions of Crhome. Some interesting links:
See also bug 4583.
This is interesting technology, but we don't have a clear use case in how this would improve things for our users. Closing this for now until we got something more tangible