Sick Squid
Got me looking for the RVR limit below which LVP's would have to be in force for departure but could not find one specified anywhere. I would therefore assume that if I were to depart with less than CAT I RVR approach minima then LVP's should be in force?
You also mention CAT IIIa minima allowing return on one engine. Does your type allow for a planned autoland in the case of an EFATO? That I find very interesting as the 757 does not allow for this.
Could your required 'protection' when down to absolute departure minima be anything to do with ensuring you line up on the centreline by reference to the localiser?
PP