Santiago: On NTFS, you can generally move pretty much any file/folder to any location, no matter where the OS/application wants to place it. With NTFS junctions I can have e.g. c:\documents on d:\documents, while every application still thinks it's on c:\, while all the files are actually on d:\.
Often used this in the past when I had small OS partitions to make image creation easier. I simply moved the big folders to other drives, without the OS noticing.
So my point is, if you have a small SSD, you don't have to use it for any of those files, even if the software writes it there by default, because you do have the option to place it wherever regardless, without any software having the option of stopping you to do so. This is around since forever.
That's great... for you. But 99.9% of gamers, especially those who use Galaxy, are not going to know what the hell you're talking about, nor give a fig.