Fixed in nightly b10504, available in public v4.0.3.
Took a pass through our design mode language files, including built-in extensions, and ensured that dropdowns that feature common nouns/verbs are all lowercase, for parity. Caught a few blocks as well that begun with capital letters.
The only remaining instances of uppercase now are: - Attribute types and the accompanying dropdown options when first setting an attribute field (Actor, Sound, Scene, Choose Attribute, Last Created Actor, etc). - Proper nouns like AdMob. Also treating sets of specific terms the same, including: blend modes, easing types, scene transition types, and screen scaling modes.