This post is not aimed towards a single object type, but just in general when using different objects, it gets a bit frustrating that some things are missing which should be there in my opinion. As these are "minor" things you tend to forget them, so ill add them here as I find them and hopefully they will be added at some point.
Frame rate - Would be great if you could get the frame rate of the video.
Number of frames - Self explanatory, but the number of frames in the video.
Format - there are other ways to get this, but would be handy if you could just get the format through a variable (Less important).
Check vs Frame rate / Playbacktime - For some reason there are no way to check vs this.
Play at FPS - Play a video at a certain fps, so you can make slow motion and fast forward.
Path - There are no way to get the path to a file on local disk. Which is strange since you can get the filename.
Filename - Opposite the File chooser object you can get the path including the filename, but there are no way as far as I can see that you can get just the filename.
Add frame - Add a blank frame to a sprite
Delete frame - Delete frame at index
Insert frame - Insert frame at index
Replace frame - Replace frame at index
Fill frame - Fill frame with a certain color at index
Erase frame - Erase frame at index