Unbounded Scrolling on one axis

is it possible to setup unbounded scrolling to only out bound scroll on the x axis? would a work around be have a camera object and every tick set the x of the camera relative the the object you want to follow and keep its y the same?, what would be the disadvantage of doing it that way? would it effect performance doing that every tick??

Unbounded scrolling is just that, unbounded.

So indeed, your solution of an extra camera object to which you fix the Y position and set the X position relatively to whatever/however you want sounds like the way to go/achieve such a custom scrolling.

As in general, performance questions should be answered by your own measurements, but in the absolute, there shouldn't be an impact using/setting your custom scrolling method to a game.

You can find examples of camera/scrolling in the How do I FAQ for Construct 2 and as far as I'm aware, they have not caused issues.