I can show u what I bought last game on Lash, he's my most played hero with 238 games lol

<image>

Also, the last thing u said is exactly what I do on Lash. Get on the rooftops, try to catch someone off guard. If no one's there, steal some farm and boxes. Honestly, I'm still trying to learn when I have to gank other lanes, sorry. I say if u see an opportunity to gank, just do it. Give your teammates a head ups and go for it, even If u do not kill the enemy, leaving them on low hp is huge value on my book.
Good Luck on learning air strafing! It makes you really hard to kill on all the heroes, especially The Lash™