As far as I know, SSD mode is activated by default nowadays with btrfs. Are you sure it was disabled?
Anyways, here's my future predictions:
- btrfs will not be avaible with Ubuntu 10.04
- btrfs will be avaible as an option for Ubuntu 10.10 which ships Linux 2.6.35/2.6.36
- I will use btrfs with Ubuntu 10.10 and it will seriously rock
- btrfs will become the default filesystem and replace ext4 in most mainstream distributions in early 2011