Z, you are an evil shadowknight and this post reads like your a squire to a palladin. Id quit dancing on egg shells around these MTs your talking about and grow a pair. Start with reading my rules.
OP, FD when you feel like it. Players can cancel it right away and it has a shorter reuse timer than HT or rescue. If someone in your group protests, FD them again.
1) Don't FD the MT when he's tanking a Epic x4 even if he is being a smart [expletive haxx0red by Raijinn]....
Don't do anything but MT. Battlemages are cowards. MT or stay at home tradeskilling.
2) Don't have FD above HT on your spell bars and miss click FD, MT's don't like that.....
Keep a copy of FD on each spell bar, if you have someone in your group who thinks they are MT, FD them.
3) Don't drink and FD at the same time, MT's don't like that....
Drinking and FD go well together. If someone gets lippy FD them. Also, if someone runs in front of you, FD them.
4) Don't FD the MT just because there Pallies and doing a good job, rest of the guild don't like that....
Keep a spot open in the group for pallies. Invite them FD them and then kick them from the group.
and lastly
5) Fding the MT twice in one night is never a good thing.
Sometimes I get in a group and theres a zerker who thinks he is MT. I wait till he is about to pull and I FD him, complain he is sleeping on the job and announce %t inc. Make a hotkey if you need to.