Hi ZL welcome to VoxCommando.
If you are using version 0.984 I believe there is already a voice command to update your xml files.
just say "Generate XML". Note that depending on the size of your library there will be a delay before this command completes and you are ready to use the new content.
You are correct about the TVShows, when you add new episodes of a show you already have, nothing really changes, but when you use this Generate XML command it will update everything, even if you have not added anything. It is possible to create a command that will only update movies which would be faster but this is something I would suggest you save for when you are a bit more familiar with the program.
Shouting doesn't help much, but looking at the actual commands can improve the experience quite a bit
click help "generate help menu" to see all the voice commands available.
There is actually a command which is "play pause". This could be changed to something better, but be careful about creating single syllable commands like "play" because they will increase the rate of "false positives" significantly.