I'd prefer a system that distinguishes them only in these particular cases, ml, mr, wl, wr. We currently already do this with s: *sed- is just considered CeC, but *speḱ- is sCeC.
So, what would be your proposed change? mReC and wReC?
A capital M seems better, so we can group them all together.
Sounds good to me! Could I entreat you to make this change?
Done.
Thank you kindly!