Yes, please do post in the Question Thread.
Here's the concept of cinematic blocks:
In cinematics, or ingame, you can use them for various pourpases. For example,'Change unit type can be used on them to turn them into a unit, also, you can make a unit go to them using 'Move to Unit'.
That's what people use them from. They are very helpful, to tell you the truth, and almost all scenarios have them. There is a guide, if I remember correctly. Anyways, QT is at the top of the page, and it's stickied, so you can find it easily.