Also, through the darker theming of Bricks 2.0, it is really hard to see the black custom SVGs. Maybe they should be colored white within the interface, too.
It looks like these options are tied to SVG upload permissions. I enabled SVG uploads for my user, and the fields are showing. I don’t know if that is already the behavior in previous versions of Bricks, but since the option in the Bricks setting is called “SVG uploads”, not “SVG usage”, I would expect that all Bricks Editors should at least see the color/sizing options.
Regarding the color/sizing options, “hidden” within the popover below the icon list rather than directly in the side panel: I would prefer a more consistent UI with the color and sizing options directly in the side panel for all types of icons (default set, custom set, SVG). But this is probably a separate thread and also not 2.0 related.