The only reason I concern myself with cam lubrication is the fact that the much leaner running conditions with CDI reduce the amount of oil being introduced when running. I also want to experiment with mixing my own fuel at reduced oil content, maybe as little as 5% when running spark ignition since stable ignition timing will help to prevent detonation.
If I eliminate nitro, A/F ratios will be even leaner meaning less oil being run through the engine. Aside from the big end of the rod, the cam lobes/tappets are probably the next most critical surfaces for lubrication due to the mechanical pressures involved.