I have also seen other versions of the "Lysanderwing" on other forums. To be honest, I'm not impressed. Although I have yet to face one, I have faced Deathwing armies before. The lack of numbers really hurt this type of army. The Lysander special rule is nice and can be effective, but overall these types of lists require a lot of practice and patience to run. My first recomendations would be:
First, I'd drop terminator squad #3 and bump up the others to 6 terminators each. As experiment 626 stated, with 5 man units, loose 3 men and the unit is no longer a scoring unit. In a 6 man unit, loose 3 men and the unit is still a scoring unit. Try to keep the number of men in the unit (excluding IC's) even.
Second, If you intend to make Lysander's unit an "assault" unit, I'd add a pair of heavy flamers. Toasty!
Third, I'd replace the assault cannons from one of your normal terminator squads with a pair of cyclone missile launchers. This would give your army 4 assault cannons, 2 cyclone missile launchers and 2 heavy flamers. pretty ballanced if you ask me.
Finally, If you have the points, I'd add some sniper rifles to the scout squad. It couldn't hurt.
Just my 2 cents...
~fearlessgod~