Does ROM Manager need S-OFF?

I want to try the CyanogenMod9 Alpha builds for the T-Mobile myTouch 4G Slide [MT4GS/Doubleshot] and all the instructions say I need S-OFF. The problem is that I have HBOOT 1.55 so software solutions like Revolutionary do not work and I am left with the JuopunutBear wire trick. I am not up for that so I will stay S-ON for now. Then, I found ROM Manager that claims to easily install custom ROMs easily, but I can not find if ROM Manager requires S-OFF for HTC devices. Does anyone know if I can install custom ROMs through ROM Manager with S-ON?