Justforfun000,
I personally see not a problem at all. The SD1's vibrato sounds great. If I should get a midifile that contains controller-data for vibrato, the removing of the data is done in a split second with the help of sequencers as Cubase or alikes.
As far as I can remember I never noticed your problem. The controller that is implemented in midi's often is the pitch-wheel.
Roel