I read Ironmax's post about suppression by machineguns. There was also a post by Keith on 3rd Jan on auto suppression which developed into suggestions that mortars and tank guns should be more effective in suppressing dug-in infantry. That seems to leave only rifles that don't work for keeping the enemies' heads down!
I agree that dug in infantry are too hard to suppress, by the time you get a suppression you have probably hit them six times and killed them anyway. But auto-suppression is a bit of a blunt instrument.
Why does the dice score needed to suppress units vary depending on their cover? Units in the open are more likely to be hit and therefore more likely to get suppressed anyway. Why not just 5 or 6 per hit to suppress anyone whatever cover they are in? That seems much simpler and means that if you get about 3 hits on infantry in a trench they will probably get pinned, creating an opportunity to get in quickly with a follow up infantry assault.
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