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Is there any possible use of Lua if I integrate it into kernel ?
It's like scripting the kernel to run, and just modify the scripts make kernel run different.

Not...really...as far as I know, only froggey and me have Lua in their os (for me just the shell) and I can't think of any practical reason to build your kernel around it (Except for lulz)

There isn't anyone have fully thoughts about this yet, but nothing is impossible. For me, I think my exo-kernel will need something to easily change it behavior.

...a libOS?

I mean, how many different ways could an exokernel possibly do things? The way I understood it, if an exokernel has two ways to go about something, it should do whatever it takes to leave that decision to the libOS...?!?

I'm not sure about this. Maybe changing the way the kernel multiplexing hardware. It surely have to be done in kernel, and no libOS allowed to do so. Or if the kernel have ability to interpret Lua apps from text, then libOSes and Apps can be developed very fast (Of course the 'file explorer', or kind of it', should do works like readding files, transfer it to the interpreter...)

If you're developing an exokernel, your best bet is to just write a libOS that is a Lua interpreter. Exokernels are not supposed to force any abstraction on the processes/libOSes it is running. A scripting language is definitely an abstraction.

That's good