Suggestion: include pointer type in event info

[Samlibardi]

Including the pointer type in the event argument may be very useful. With this, the end dev is able to figure out whether he waits for the delay or don't. Example: touch drag-n-drop usually requires the delay, but for mouse users, it's not intuitive to wait to drag. So I've implemented this in a hacky way, but it would be nice if it was a given information in all slip events.