yes
changing AA/AF settings in the LFS profile in the nvidia driver (either with the driver control panel itself or with nhancer) does not work
the only option is to set the AA/AF settings in the global profile (which applies to ALL games )
nope it depends which resolution you are driving. on a 30" TFTs with 2560x1600 you can clearly see a difference between 1024 and 2048, the same difference you see on your 19" between 512 and 1024 2048 should definitely be a choice! (make them 4x more expensive than 1024 and there's absolutely NO reason why this shouldn't be implemented )