Can I Add All Ready to Install Games to Queue

Yes you can but they wont all be downloaded

Unfortunately not mate. You will have to select them individually. I guess this is a default option to save bandwith in the error you dont want to install all

That would be a nice feature to have, along with the ability to uninstall multiple games at once, like a check box you could select to add your ready to install/uninstall items to a queue in one go. Yesterday I uninstalled 1.9Tb of games and one at a time
is a bit of a drag.

As it was pointed out, no, there's no way to mass install everything on the ready to install page that includes all the games. However, there is the option to install all the content available in a game itself by opening a game's menu and going to "manage
game and add-ons."

I've got to ask, what's the storage capacity on your console/hard drive. To even be able to download 100 games (assuming they're roughly all medium sized) is an astounding feat, in my opinion. Also, what's your internet speed? Because If in theory you could
download 100 medium sized (like 15 to 30gb) games at once, you're internet would have to be pretty strong I'd think. I mean I'm no expert but it sounds like you got some good internet to even want to do that.

You must have a decent external drive to fit 100 games lol. I suggest doing it in blocks of say 20 select and download the 20 games you want most and play something while they are downloading once the 20 are done repeat for the next 20, and so on.