Change cursor shape within editing area from "pointer" to "text"

While a minor annoyance, it appears to be a major usability issue and makes ST2 feel less native (and just plain different) when mouse cursor is being displayed as a pointer _anywhere_ within the editor window. Chanign it to "text" cursor shape when editing area is focused, or while manipulating text as any other text editor/ide does, would fix the issue.

Thanks.