i know the Unreal Editor isn`t totally finished at this moment. also it is already great in so many ways
my suggestions to improve the software even more concerns the particle system cascade:
I think the workflow to instance a parameter is a little bit confusing at the moment.
i think the instanced parameter should be visible in the instance parameters section (in the details panel) without the user manually assigning it.
moreover the parameter should automatically be of the right kind. like a color is a color only, and a float is just one float value.
when you are in blueprint and you want to drive the instanced parameters, there should be a simple dropdown with all the available instanced parameters.
this way you dont have to keep track on all the parameter names you used.
i hope its somehow clear what i mean
all the best!
keep up the good work!