Not sure if comparing classes in hit result counts as casting and what are the performance implications. Judging by how (slow) blueprints work in general, I’d like to think this is negligible unless you’re going into 1000s every frame. I’m not suggesting sloppy coding here, though.
See if you can work with tags then, not exactly what you’re requesting but might be worth a try.
If you’re requesting an official feature, you’ll have more luck in here:
https://forums.unrealengine.com/unreal-engine/feedback-for-epic