Well just letting you know that rangers barrage and rouges feint have hidden synergy
Im also assuming you meant this for your build?
If so I suggest you dont go 2 ranks of ranger or 2 ranks of scout.
Instead why not go this:
Rank 3 can be changed to anything you like or need.
The concept behind this build is to have all the cover you need to stay safe. While maximizing the ability to allow yourself to get those backstabs with stuns, invisibility, etc.