Speed limiter, rev limiter, boost cut control, and timing are definable when ordering. The rest are the off the shelf tune.
The only thing I would worry about is the injector size is adjustable and it may have been trimmed for larger injectors.
These are all concerns with buying a used tuned ecu. Unless you have the tune in writing from the tuner you are at the sellers mercy. That data could be 3rd party or the seller's recollection could be wrong. I would not get involved unless you have access to a dyno and at least a wideband sensor. There is a chance you will have to get it retuned.
Since you have a VX-ROM there should be a tune code on the unit. If not you will have to send it back to them. At that point you may as well have them retune it to your spec.
http://www.mines-wave.com/E_09/Inquiry_E.html