Sander,
to have the VA 7 recognize a D sus you have to play D G A; if you then add the E (D E G A) the display will read Dsus9 (which is like Dsus2, only an octave higher). On my VA 7 this works both in Piano style mode and in Standard mode (for the arranger).
Hope this helps.
Andrea
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.