How do I?

First let me say I am a great fan of R2E and that R4 looks like it's going to be much much better.
As R4 is still a Beta it may just be that these bits arnt done yet or it's just me being thick, but is there any way to get it running full screen at the moment not just a screen filling window? and after looking at some of extra scenes I thought I would try to put some in, but have no clue as to how to do this, as when you click on the download it just comes up with what I assume are the parameters for the scene and I have no idea how to use them.
As R4 is still a Beta it may just be that these bits arnt done yet or it's just me being thick, but is there any way to get it running full screen at the moment not just a screen filling window? and after looking at some of extra scenes I thought I would try to put some in, but have no clue as to how to do this, as when you click on the download it just comes up with what I assume are the parameters for the scene and I have no idea how to use them.