Allowing 'en route' check-ins

Here's something I'd appreciate. I dislike checking in from my iPhone (compared to my desktop browser), and I usually know where I'm going before I leave the house. It'd be nice to be able to check in as 'en route' to a location, and then send a text from my iPhone to 'complete' the ckeck-in - thus removing the 'en route' check-in from the stream and adding a traditional check-in to replace it. En route check-ins should never show up in the stream unless they're the latest item (spam!), but it'd be a good way to hook up with people - if you know somebody is en route to, say, Denny's, you could text 'em and say "Hey, mind if I come with?". Also, it'd save me having to try to type any complicated names on the iPhone (web interface *or* SMS), and just allow me to send one character to 'complete' the en route check-in (I was thinking an `@` without arguments).