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Not sure i follow your question.
Can you give some example of the KPIs you mentioned - Mean up time and Mean down time with examples -- as detailed as possible (fact data details)?
On the face of it, it looks like these KPIs should be Calculated Measures involving Time expressions on date columns (date datatype =day+time infomation present in source columns) but nothing in it which needs a customized time dimension. Maybe not out of the box but very much doable in analytical layer (either using olap or relational rpd). So it should be do-able without needing any changes to the default time dimension available with OCDM.