guys, keep it simple!! geeze!! You don't need to enable/disable more/less important hotkeys. There is now a keymap.ini file where you can change them if you don't like the defaults but the UI will come when it does (not high on the priority list right now). However, when there is a UI, the changes will take effect immediately, it would be insane/absurd/etc. otherwise. Either way, yea, it's off-topic. I don't recall if you can toggle photo-mode from a hotkey at the moment, but look in the hotkey.ini to see if there is a setting for it.
But back to the obscured units, I'm still thinking on the lines of an outline (much like AOE), but I'm starting to like the transparency idea (i.e., cause the obscuring unit to become partially transparent?) Then again, I think I'll go for the outline
-- maybe unless it's a non-unit model, like a tree, stone, etc.