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It's not an object, so no. Overrides are really the only option.

Could that be possible through an extension?

Overriding an SSP file is a pretty serious change to make, so I don't anticipate we would ever implement a way to override it through an extension.

I would like to have login and register into seperate pages

Yah I'm aware. I don't know how you would do this with an extension

And it's SCS I can't replace touchpoints atleast 

looking at the declared page types for it (LoginRegister.ts) we support a distinction for login and register

My guess would be that you could register alternative templates for both login and register, and then use the SMTs to serve different ones for each one

Seeing as URL parameters allow for the distinction between uses of the login-register page, I would explore template/view customisations before going straight for SSPs