Improvements to Additional Spells Optional Feature

With Tasha's Cauldron's release, we have the Optional Feature Manager in the character builder. One of these optional features for many classes is the "Additional Spells" feature.

Currently, such a feature states all the spells as they appear in TCOE, including PHB spells and the "new" TCOE spells. When optional feature is selected, however, only the PHB spells are added as "optional", since TCOE spells are automatically added to their respective spell lists (as it was the case for other non-PHB sources like XGTE... which makes sense since the person that purchased the book likely wants these new spells in the game by default...

However, Tasha chapter 3 says: "This section contains new spells that the DM may add to a campaign, making them available to player character and monster spellcasters alike. [...] If you’d like to use any of these spells, talk to your DM, who may allow some, all, or none of them."

This is in fact true for any spell in the game.

Suggestion:

Under "Additional Spells" in the Optional Feature Manager, have 1) a "Source" box ; 2) a drop down menu for official PHB optional spells.

1) the Source box could work like the Source Category box for the Search spells feature. Simply select allowed non-PHB spell sources for that character (e.g. XGTE, EGTW, SCAG, ACQ. INC, etc.)

2) drop down menu would list all the Optional PHB spells mentioned in TCOE. The player (after talking to its DM) can select some, all, or none of them.