Hi, I recently started a transition to a new type and my instructor was told by the airport authority to set "X-ray" into field #8 "type of flight" (and add "RMK/SCHOOL FLIGHT" into #18) of the ICAO flight plan. I was unable to set "X" as the Type of flight, as SD only allows to set VFR/IFR/Mixed.

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You are not correct about the pilot name and telephone number. By default in an ICAO flightplan those are put into supplementary information, which is not routinely transmitted alongside the main part of the flightplan. Many countries will reject a flightplan that contains the supplementary information in the initial transmission. That is why we include the information in the main part of the flightplan, in Item 18. It is used on a daily basis by ATC agencies across Europe to contact pilots who have filed with SkyDemon, where necessary.