I should have said that I meant Shadowmeld, i.e. using it to drop combat. If done in any form other than cat, you can't immediately go into proper stealth without first coming out of stealth and suffering a GCD, so being able to instantly cast flight form is useful.
I agree that LiteMount isn't causing the problem, I just think that a class-specific override, if it could be added without too much work, would simplify things. I've worked around the issue by creating a separate macro for my druid and binding custom set 2 directly to shift-MB3, but for the sake of simplicity and easier maintenance, I'd rather not have multiple macros or character-specific keybinds.
Anyway, if it's something that can be done easily, then please add it to your to-do list. If not, then thanks anyway.