Merge move and resize functionality

I think it would be possible (and desirable) to make a multi-tool. It would combine the resize and move tool. If you are mousing over in the middle then it moves the clip. If you mouse over near the ends, then it resizes. Audacity has something like this.

There are still a number of oddities with the resize tool.

It would be very cool to see a zoom hot-key (like + and -) assigned. Additionally, holding control and scrolling with the mouse wheel could also zoom in/out.

I like the idea of mousing over the middle to move the clip and hovering near the ends to resize the clips.

In both cases, the resize should have the ability to extend to the very start of the video, and the very end of the video.

If the inserted audio clip, for example, is 2 minutes long and starts 3 minutes into a 10 minute video, I should not be able to extend the audio clip by resizing it to a length longer than 2 minutes. Consider the following scenario:

1. User resizes a 2 minute audio clip to 1 minute (this should crop the end of the audio clip by 1 minute).
2. User moves clip to the 5 minute mark in a 10 minute video.
3. User decides to resize the audio clip to make it longer.
4. User extends the audio clip to its original 2 minute length.
5. User continues to extend the audio clip.

At this point, the audio clip should "lock" for a moment (i.e., snap into place). As the user continues to "resize" the clip, it should (being fixed at 2 minutes in length), instead be moved, because it makes no sense to extends a 2 minute audio clip longer than 2 minutes in length.

An image clip does make sense to extend, however.