Never tried to do it, hence I cannot be sure it's so bad; probably only Igiss is the one who know for sure. My guess is that the problem cannot be solved modding, I you really want the ships to do not disappear while docked to the mooring fixture you should modify the graphic engine and it would take a huge effort do recode it.
Moreover I don't think that Microsoft has released the source code of the engine (please, somboedy correct me if I'm wrong) hence... copyright infringment...
Lump Lorry on behalf of the Lorry Family
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(Former chars on Disco 4.82)-- The old Lorry Family --
Lump Lorry freelancer trader. chief of the Lorrys | Manta Lorry freelancer pilot | [HF] Cesare Lorry fighter pilot, HF member | sso|Ace Wolverine Lorry bounty hunter | [RM] M(anfred) Von Lorryhofen Rheinland Military pilot | [AEGIS] GB 303 Ticonderoga AEGIS artificial intelligence gunboat | (secret
member) In charge of keeping the family's secrets