CSFU=1 is GOOD! Do it.
While hits to the swap file with 256MB of ram are rare, IMO, I would set the swap file to permanent and go ahead and "waste" the disk space. These days, most users have plenty of room to spare. (not too often I disagree with Andy, he's good), but with that ram I would set it to 100MB min/max on an empty partition so it's contiguous...just my preference. 😀