@bschussek what do you think about it ?

The first point is already possible by using the "group_by" option of EntityType. As for the second, I need to research whether this is possible, but it should be.

Ah, I misread. So you want to extend ChoiceType. What's the use case for a tree-like choices array? (I assume you don't talk about option groups right?)

OptGroups are good to group choices and are usable too. But in tree of choices root elements have to be selectable too. In optgroup this is not possible, as they are only labels.

Here are some common use cases:

• root directory with subdirectories and their subdirectories,
• menu and submenu (where to add new page),
• regions, districts and their cities (region or district can be also selected),
• tree of payment methods (direct payment methods like PayPal,CardPay, offline payment methods...),
• tree of categories in eshop (where to add new product).

To make tree of choices more visually attractive, javascript can be used to hide nested choices (and show them only when parent is selected), to select all child choices when parent is selected. Of course, this is task for programmer, not for the FormComponent.

Anyway, more important is to have choices with custom attributes.

@pulzarraider Thanks for your feedback. I created two new issues for these feature requests (see above). Please check them if they fit your needs.