2) Double edge drag/drop (new way, not old one) now allows for overwrite and insert and colors are as follows:
 green means OK to drop
 yellow means OK to drop and will right next to the other edit AND if you hold down Shift at the same time, it makes a space too
 blue means OK to insert here between edits (this was not available to do before)
 red means while holding down Shift key and dragging, it will now let you overwrite on the edge (different than before)
 orange means you can not drop anywhere on this track; for example, you can not drop a video clip on an audio track