Easy way to rotate small tiles, objects, etc?

I'm currently working on a puzzle map that's going to involve a lot of rotating squares and I need to be able to turn them without throwing the entire map out of whack. Is there a shortcut or simple way to rotate small things? Whenever I click on something, there's that little flag that you can click and rotate it. However, whenever I do this in the MAP layer, it's so easy to grab the map instead of the little flag, and I end up moving the MAP.

You can use the mouse wheel to rotate selected items.  Hold E on the keyboard and roll the wheel to rotate by 45º, hold Alt-E to rotate by 1º.

Amazing, thank you, exactly what I was looking for.