The real problem for the IMCR holder is that usually the approaches flown during training are not to the tolerance required for an IR. Therefore an IMCR holder must develop his skills in line with his "willingness" to accept lower minima. If he does so in a controlled way he will achieve the same skill level as a newly minted IR holder, if he does not, he will need quicker reactions and a steady hand the first time he becomes visual after an approach to near minima.