As an observer (ie I don't work for EZ or FR) I would like to point out something that is probably obvious.
For years in aviation, in my time anyhow, management have endeavoured to 'nibble' away at employees T's +C's, especially when times are hard.
IF anything is given up, however trivial it may seem, you can guarantee it will be far more difficult to 'claw' it back when things improve.
This is one of the reasons the aviation industry has lost so much ground in the last 30 years.
Nobody wants industrial action as that can, and has in the past, lead to the demise of a Company. There are enough unemployed, experienced guys and girls out there already.
I don't know the answer but feel that burning the extra fuel is probably the most effective way of making your point as long as it can be done in a justifiable way. Why should you freeze in your 'place of employment' by not running the APU (as Stone Cold II pointed out - H&S issue there?!)
Good luck
Rgds
CL747