Freakler just released uriCaller, a tool that lets you call “special” URIs on your PS Vita.
uriCaller lets you run some “magic” commands from the PS Vita, that lets you run some otherwise “hidden” features of the PS Vita. This should in theory let you run for example the package installer (provided you have installed the “devkit” version of that app) without the need for creating a bubble.
Running these uris would typically require going through some weird proxy trickery,so no doubt that this tool will be a useful shortcut.
Freakler mentions a few things that can be tried, be careful as some of these things are quite powerful (note the format command for example):