You're welcome!
Yes, you can continue to request sets here!
There is also another way to do it, which is to click into any Category and subcategory (it doesn’t matter if it matches the TCG you’re requesting), and then click on the link for “Request a new set type here” that’s located just under the card image. I’ve attached a screenshot as well for reference. Either way you prefer to do it is OK.
I’ve added the Unique Foils and Ordinary Foils to the list, they’ll get posted on the registry chat board thread titled New Releases once they’ve been added so keep an eye out there.
For the Main Set, Avatars, and Sorcery Nine sets, those can be completed with either a Foil or Non-Foil variant. If you click on the set and then click on “See eligible cards,” it will take you to the Eligible Cards page, where you can select a specific card, or if you scroll to the bottom of the list, you can choose “All Slots.”
In the screen shot below, I’ve chosen the Alpha Avatars set and selected the Avatar of Air card, you can see that both the Foil and Non-Foil variants are listed there. I hope that helps! 😊