is it possible to use ue4 for non-game apps?

i am thinking about using ue4 to develop non-game apps
but things that confuse me are:

1-how to integrate new SDKs, APIs.etc into unreal?

2-how to use standard frameworks like xamarin and .net with unreal?

3-how to limit ue4’s resource consumption?

4-is it possible to use skookumscript to develop application logic

Yes it is; I once made an interactive “book” app for a company.

1: C++ plugins.

2: C++ plugins & source code mods.

3: limit shader instructions, optimize assets, and manage your application properly to make it use little hardware resources.

4: Yes, although I personally think C++ is easier than their weird voodoo scripting syntax.