LOL K'aldar I didn't even notice that you didn't mention it was a stifle. But I knew it was and was just pointing out that rangers don't receive a stifle skill. And yes I know it has stealth and positional requirements.
As for the trap I listed it seperate do to how it works. Unlike your root skill which is attached to an attack the trap is only good at the beginning of a fight. The trap has a long cast time (4 or 5 sec's I think but I'll have to check) so trying to put it down in the middle of a fight is extremely hard do to interupts.
I agree with you the trap is a fun skill even with them stealth nerfing the hell out of it in LU20. In general the skill works the same but they did something with the trigger area. You need near perfect pathing on the mob now to set it off. It's pretty sad when I use it in groups and end up having mobs standing on the edge of the trap on both sides and it still doesn't go off 
Used to be a great life saver when you got to many adds. Drop the trap and root half of them then back off and kill the unrooted ones. Poor trap just isn't the same since LU20
I still think you guys should request the Dev's change your root skill to a 2-3 unbreakable stun. Never really understood why assassins got a root skill to begin with lol.