My personal preference was always to tune VHF1/HF1 on RMP 1 and VHF2/HF2 on RMP2 and VHF3 on RMP3 (when not in ACARS mode).
Not because it would be done incorrectly very often at all, BUT because when it WAS done incorrectly the consequences could be significant - think loss of comms over sensitive areas etc. Nothing to do with SEL lights etc - think also 4 in the morning when knackered and when operating at 20%.
It is just good practice - KISS.