Add option to set default bang on homepage

[M1N0RM1N3R]

I've recently begun using Und*ck as my default. It's so simple yet so ingenious. Love it.
One feature that I find missing is an option to set the default bang/search engine on the homepage.
I know that one can set the default bang using a localStorage key, but even for a rather tech-savvy user like myself, it feels a bit hacky having to do it in dev tools. (And even more so for mobile browsers, if it's even doable on most)
I'd suggest adding a text field and/or dropdown to the homepage to set that key for users who may not know (or want) to do so manually.

[valyntyler]

something as simple as adding an optional url key like default=mysearchengine would be awesome

[driftywinds]

Came here to ask for this, please implement this!!