It's great to see a bit of a resurgence of the Radial Arm Saw with folks buying big old machines and putting them back into service. I have two of them, a 14" Wadkin BRA and a huge 18" beast that is in 100 pieces, slowly being brought back to life after decades of abuse at a post and beam factory. Another RAS owner I know had a custom block made for him for hogging away material when tenoning. Its actually a modified tenon cutter for the shaper. They make versions that are adjustable for width but are much more expensive and not necessary if you're just going to use it for hogging away material. Graule is a known RAS manufacturer and they ship their machines with the adjustable version if requested.
Here are pictures. The black one is 300mm x 31.25mm, Z4 dual shear, the grey one is 300mm x 50mm Z4 dual shear for use on the big 18" machine when it gets rebuilt. Of course these are chip limiting but even without that, have very limited inclination to climb and are easy to control.
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Like I said my big RAS is in pieces but the other is 1000 miles away till spring so I'll hand it on without any sawdust on it I guess!
B