Solutions
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JYW's post in Learjet 35 autopilot help was marked as the answerThis is correct behaviour for the aircraft. Very few autopilots in real aircraft have a default VS that instigates as soon as altitude is changed, or VS mode selected (this is a sim 'convenience', I guess).
To adjust VS, you use the pitch wheel on the main AP controller (behind the radios on the pedestal if memory serves and I'm not confusing it with the MU-2!). The default FSUIPC key commands for AP_VS_VAR_DEC and AP_VS_VAR_INC also work. Cheers.