LK-DMIS 5.3 which has now been released addresses this problem.

Firstly, the requirement to use TOL/POS,2D to determine an MMC bonus for a datum feature has been removed, if not used a TOL/POS would produce the error message "feature not valid for MMC tolerance". Now the only requirement is to apply a TOL/DIAM to the datum feature, once we know the nominal and tolerance limits the MMC, LMC values can be determined.

Secondly, MMC and LMC are fully supported.

Thirdly, MMC bonus for multiple datums is calulated correctly.