Rangers are feat starved, so I wonder if the following suggestion could be considered :
TWF style : add also the three TWD feats in the line
2H line : add also shield skin feats line
Animal : Add some animal boosting spells as abilities like cleric domains or whatever (grater magic fang, nature's avatar, jagged tooth you get it)
Archery : Add the the longbow weapon focus/GWF/EWF line. IMHO marksman becomes irrelevant nowadays anyway.
Hunter : I don't know it for now, can't say
Is that bad idea ?