why doesn't fix_efield work with minimize?

hi
  I was wondering why fix efield which just sets a constant force on the atoms f_a += E q_a doesn't work with minimize? I would guess there is a straightforward reason but I can't think of it (the energy associated with E is easy to calculate .. I think).
  the reason I ask is: I want to do something similar,
thanks,
Reese

Someone would just need to add it - similar to the bookkeeping
in fix addforce.

Steve