Here's a feature I STRONGLY suggest :)
On Bitnami Native Stacks, I would like each one to come with a web browser that is somehow integrated/sandboxed along with the Stack. This basically just means making the default URL in the browser and the various hosting ports of the Stack's servers bound together. And maybe you could integrate with the browser's login manager to automatically log me in, and give me bookmarks on the bookmarks bar to all the important URLs for the Stack, or automatically installed and configured relevant browser extensions. And of course whatever changes I make to the browser (adding bookmarks, bookmarklets, extensions, preferences, etc) would be saved with THAT STACK'S browser.
So for each Stack I have a complete development environment that doesn't conflict with the others.
...On a side note, other nice things could be integrated with each Bitnami Native Stack, like a VCS, or even a native (Mac, Windows, Linux) GUI frontend if one exists for the given Stack app.