It would probably be a good idea to search the thread first as there are answers to several of your questions. Nevertheless, I will give you a recap:

1) No need to, but you can if you wish. I've never heard of anyone having issues

2)No, I've done it and gotten a laugh from the crew but no animosity. Truth is that on EK, the Arab flight crew are few and far between

3)No, the other Belgian caterer. Still not very tasty. Probably best to go with a fruit platter

4)They will probably provide the long like meal

5)NO

6) You are officially not allowed to bring any meat at all and all bags are scanned, but we had no issue in MLE at all. A friend of mine had his grape juice taken away even after he showed them that it was not alcoholic

Hope that helps...