CV105 and CV106 are of no relevance.? They are for end-user notes, so their values are “whatever the end user stored there”.?
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The Dapol Imperiums are not very common.? Dapol are a niche supplier to the UK, using rebadged from elsewhere decoders, and very limited documentation (long running threads on UK forums about lack
of documentation for various Dapol decoders).?? ??Its only going to get updated on JMRI if an end user is interested in adding it.? ?Otherwise, pick the nearest and it will be OK.
If it doesn’t show up when you do a New Loco, it means that particular decoder hasn’t been defined to JMRI. To be blunt, that’s because none of the wonderful people who maintain and develop it have seen fit to add this decoder to JMRI.
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What values do you get for CVs 8,7,105 and 106? ?8 and 7 are the manufacturer and versions types, with 105 and 106 also reserved for ID values.