Re: How to configure drow's frost arrows?
Just leave it off all the time, when you want to attack enemy heroes manual cast it.
1) You won't draw creep aggro doing it this way and this is always helpful.
2) If there's movement involved (you're running away / chasing the enemy) you will want to orb-walk and animation cancel anyway. You need to click on the enemy, click to move, click on the enemy, click to move. The only difference is you need to hit Q in between - it's not more work.
3) If no movement is involved, then you don't want frost arrows active anyway, so you can use your lifesteal orb effect. Or you could just spam Q if you really wanted, it's not difficult, since you won't be doing anything else.