I like 5iler a whole lot and I second adestefan's advice. I use a Linux system and don't have cmd keys. I'm wondering if, since some browsers (at least Chrome + Safari) use cmd+1/2/3 to switch tabs, if maybe replacing cmd with ctrl would be easier for everyone involved?
I was a bit obtuse in my original comment. Ctrl does work fine. I then tried Alt since that's in the position of the Cmd key, but that didn't work (which is a good thing because then it doesn't eat the browser's tab switch keys.)
Great app and excellent design. Call me a fan!