Hey there great job on the Viruses, so far. I've had two, I gotta know! 
An overhaul of the TI2 display would be fine in general, as many people want to and will use their viruses with the hardware interface only.
Every function of the Virus should be editable in the hardware (arp, for example).
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but let's start small: what about a "category lock" function?
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It would be great if we could lock the category to, say, basses and then scroll through all basses.
Oh and one big endless rotary encoder would be great, for this and other functions.
Cheers,
Barely.