How are videos added?
There is an add video link added inside the category.
Do videos automatically get a thumbnail, even if they are linked from youtube for instance?
I have added basic support for auto thumbnails for some video types such as mpg requires ffmpeg php extension. Linked videos there is no picture shown but you are given an option to add an image for thumbnail
Could SWF files or links be displayed?
SWF Files are supported
Is there an option in search where you can only search videos?
Not at the moment but could be something that can be built.
Are videos coupled in the same category as the images?
Yes they can be mixed into the same images categories. Adds a permission called Add Video
Will the "Related images" PHP block also show related videos?
Yes it would