Dear Daniel,
you can replace the default MIP.mat when editing defaults.stats.results.mipmat in spm_defaults.m . Maybe you also have to adjust some values in spm_mip.m and/or spm_mip_ui.m , dunno.
Nie et al. (2013, Human Brain Mapping) provide a toolbox called spmratIHEP for preprocessing of rat data, including a rat MIP. For contact address check their paper (don't want to post a mail address here), maybe this is also helpful for your purpose. Another toolbox SPMMouse http://www.spmmouse.org/ seems to allow to create MIPs as well, I haven't tried that though.
Best,
Helmut
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