Not that I try to push my agenda but:
https://forums.unrealengine/showthread.php?4409-Editing-class-field-variables-in-properties-without-need-to-spawn-object-from-class
Is it possible for blueprints ?
Tl;dr version.
Can class variables in blueprint, have exposed properties of said class in blueprint where the class variable have been created.
For exapmle we have Blueprint_A and Blueprint_B.
Blueprint_A:
float Property_A
float Property_Test
Blueprint_B
class’Blueprint_A’ Blueprint_A_prop
Now select Blueprint_A_prop and in Default Properties you can edit it’s fields:
Property_A value
Property_Test value.
As it stands now you need to either create new blueprint with new values, or spawn blueprint in graph and set variables then. Which is not possible if your blueprint is not derived from Actor, which in my case is very often case.
So in my case, solution is to add native properties in C++. Which is no good solution either, as it create properties that are not used in most cases, or complex inheritance.