I don't know which computer you are using, but the only one I've seen where the user can reduce the RGBM by 50% is the Vyper Air. I had one for a year before it went all wonky on me and had to be replaced under warranty with a Vyper Novo, which does not have this option. I've also had a Gekko, my wife has a Zoop, and I have a console mounted Vyper (non AI) as a back-up, none of which have this option. Other than that, I don't know if any other models have had this feature or not. Just wanted to clarify that not ALL Suunto computers can reduce the RGBM.
Yeah fair enough, I should of been more specific. I was on a d4 that had it (screen from manual attached) and then a d4i. On the latter I never checked if it had it or not, and I can't find it in the manual. So it could be removed in the newer version, kind of like your replacement.
On the eon core (and steel I presume), you would just start setting the personal level as -1 or -2 of you wanted a less conservative calculation.