It's not Mark. It's Bill. Mark may be busy elsewhere, like maybe the 3D forum, working or even flying to some far off place for more video. But he taught me everything I know, except for which camera to buy last summer. I a different one than the GW77, so I probably don't belong here! (grin)
" the difference looking thru the lens vs a LCD panel. That would be really usefully in training my handling, what to look for and re-program my perception."
It is not about view finders and LCDs. It is about what you are looking for. With photos you are trying to catch split seconds or freeze frames. With video you are looking for interesting motion and good sound. The minds eye has to work differently.
"As u prolly also know, in SLRs or DSLR, no one uses much of the P mode. But it's opposite in camcorder according to you."
I watched a Lightroom 4 seminar somewhere on the internet. It was conducted by an Adobe executive. When you install Lightroom you are given the option of sharing usage data with Adobe so they can tune future releases. For all the converstion about the need to use manual controls for good results, the real data at Adobe says that automatic modes are by far the dominant mode, both in shooting and post processing -- even for working pros.
" REEEAALLY NO ZOOOMING??"
It hurts view eyes and makes people seasick. Watch TV or YouTubes. When it is used right, it is so slow and subtle it enhances the video. It has to be slow and subtle enough that the viewer does not notice. Same for panning. It's like Tabasco. A little goes a long ways. If you watch Marks travel or baseball videos you can see how little he zooms and pans.
"Would it be better that I stop the video and then do close up when he takes the stage? "
Don't think like a photographer. Think like a videographer. I would probably do the zoom, but edit around it in the computer later. A pro would use two camcorders and mix the clips in editing. (I'm trying to learn how to do that in a project documenting a family elder talking about family history. I'm mixing clips taken by my two granddaughters.)
"Or is it better to keep videoing the performance, when it's his turn, pan it to his direction and slowly zoom in? "
You are thinking video! Good. With a photo camera you would see a wide shot and a zoom shot. With video you have to figure out what to do with the in-between. I googled "kindergarten concert". There are plenty to look at where you can see what others did both right and wrong. FWIW this one seems to be something I would watch: https://www.youtube.com/watch?v=BM6ouKDHS60
Here is another with less than the best pans, zooms and camcorder stability: https://www.youtube.com/watch?v=E8ol7ED9Qcs&feature=related
"Mark. I am sorry but I lost you at the last para. Can u kindly elaborate??"
Again, it's Bill. I was referring to video editing in a computer. It is part of what makes video compelling and has only been easy for a few years. Video editing software allows you to mix many layers of audio, video and photo. Using the kid concert as an example, you could set up a primary camera or a sound recorder to get the music. Then, if all the other parents shared their video and photos you could layer them on top of each other, selecting the best shots and clips while keeping the music intact. Watch the news on TV. They do it every night. The anchor will start off as a talking head in the studio. He/she will continue with the story while another clip from another camera at "the scene" enhances the story.