FWIW, the Ilford RC Warmtone and Cooltone papers both respond well to toning, and have done so since they came out as part of the older, MGIV RC version.
The more standard MGIV neutral tone papers - the ones that were Ilford's most used paper for many years, were exceptionally consistent from batch to batch, but part of the way they maintained that consistency resulted in them being relatively unresponsive to toning - particularly with respect to image tone in selenium. That paper does respond nicely to Sepia and Brown toner plus many of the related indirect toning ottions. The Cootone and Warmtone MGIV RC versions were much more responsive to toning, including selenium toning.
The current neutral tone, Warmtone and Cooltone Ilford RC Classic papers - sometimes referred to incorrectly as MGV RC - are apparently more susceptible to toning, including selenium toning. I'm still using up stocks of the older stuff, so I have no direct experience of that.
FWIW, I really like the MGIV RC Cooltone which, ironically, looks really good when toned with the Sepia toners. It also cools even further in selenium.