How to 'scroll down' when there's nothing more to show? (cause I like the blank space)
There really isn't a neat way of doing this.  I normally hit Command + down arrow.  This will bring me to the end of the page, where I can then press enter a few times, or if using textmate, you can create a snippet to insert carriage returns for you.  With an application like textexpander you can program a keypress to add carriage returns for you.