The current 16px Custom Icons you can pick on Orion RC are hardly to identify on Standard Screens above 24"-34" Screens. Even for my good Eyes a challenge on a 16 Inch MacBook Pro.
I would set a setting, to scale them either seamlessly as in ZEN Browser, or given 4-5 Size Options, since we use SVG, it shouldn't be a problem from the macOS Emoticon Picker.
