Hi Laney,
extreme energy transfer are indeed included in the FLUKA treatment of electro-nuclear reactions, as the following spectrum of secondary electrons resulting from electro-nuclear reactions at 3.2 GeV on natural tungsten shows:
Note that, depending on your target thickness, reactions at lower electron energies and especially reactions by bremsstrahlung photons may play a role.
We miss an exhaustive description of the implemented model, but you can find some hints at https://doi.org/10.1051/epjconf/201714612005 (Section 3) where the two components of the virtual photon spectrum are briefly introduced.