Hm that's interesting, every side-by-side conversion I've seen has the freezer compartment acting as the kegerator component, while the fridge side would act as your fermentation chamber. Thus, the freezer side is set to 35-40°F, and the fridge side would be ~60-70°F.
If you're just using the fridge side as a fridge (i.e. for your kegs), then I wouldn't think any modification is necessary. I know opinions are like butt holes in that everyone has one, and you always think everyone else's stinks, but IMO 33°F would be too cold for beer to be served. You'd have to do some pretty serious rewiring to bypass the internal thermostat.
If you're already getting it to 37°, I don't think you'll notice a 2-3°F difference enough to warrant having to go through all of that.
