I believe the weapon Enchants have all be regarding personal preference but most lean towards the 15 agil weapon chain off hand. Yes Crusader effects monks, and can be good to run mainly for BM monks though, a Windwalkers main Damage comes from Tiger Strikes which procs off white hits, so you wanna focus more on getting white hit capped (pyrium will do it for you) now if you wanna try playing around with switching main hand weapons between crusdader and 15 agil feel free but alot of Windwalkers find it just easier to run 15 agil all the time to increase over all damage constantly.
Finally when gearing Agil>Hit>Expertise>Crit>Haste
that is the scaling I used when deciding on what gear I wanted to use and I hope it helps you decide on your gear choices. If your running Pyrium Chain you wont need any other Hit (still use boa helm as the agility is still better than the extra 5 stam from LFH)