If I might be permitted to butt in here…
If you change the value, a keyframe is created. Assuming that the stopwatch has been clicked, of course. There is no need to add a keyframe that way.
On the other hand, I put in a feature request (please do the same) to have a way to set all of the beginning keyframes to the current value. In other words, hit the stopwatch and set a keyframe with one keystroke.
To join clips easily, you can use ripple delete, or, you just need to make sure that “Snap” is turned on. Then you will see a verticle line show up to let you know where you are. Snap has an icon on the timeline window just under the Sequence number and timecode. Looks like a magnet.
Steven
Adobe Premiere Pro 1.5 / After Effects 6.5 Pro https://www.stevengotz.com
Learning Adobe Premiere Pro 1.5 https://www.lynda.com
Contributing Writer, PeachPit Press, Visual QuickPro Guide, Premiere Pro 1.5