Sorry, but you REALLY need to switch gear in your brain from 3d software (blender or whatever) to a game engine.
If you need that “redo last command” - that’s what’s called “tedious repetitive work”. In 10 years working with Unreal I never ever needed it. If you want lights in a nice line with equal distance between them - please make a blueprint for this. That’s the right way to do it, that’s real “fast workflow”, not your blender’s shortcuts.
When it comes to working with a 3d scene, Unreal easily beats any 3d software like Blender/Maya/3ds max because Unreal is made for that. Learn Unreal’s tools and proler workflow, instead of trying to clumsy reproduce Blender’s workflow.
Unity’s editor is a bit of a mess, because all components with transforms are scene objects (yes, if you have a skeletal model with 100 bones, each of these bones will be selectable in the editor - that’s how ridiculous Unity is). And complete lack of nice tools for world building. But still better than 3d software at this.
(Btw, Unreal has option to make objects unselectable if you need)