After further investigation, once you have improved two weapon fighting as a ranger, taking the required feats to get there as any other class in a multi class environment is wasted. A lvl 16 Ranger, armed with light armor, and dual wielding regular kamas gets a +19, +19, while the same basic build, only with Monk lvls gets a +17/+17 the main difference being Ambidexterity/Two weapon fighting feats. Note, for the purpose of this test, the Ranger was lvl 16, and the dualclass monk was Ranger 9, Monk 7.
|