First of all, do all the fields displayed in WDump together account for all the data in a w3d file?
Regardless, I think it would be very handle of WDump allowed fields to be modified. This would be especially useful for w3ds where the source is no longer available.
Lastly, I remember two tools, w3d2xml and w3dxml that seem to export a subset of the data w3d like WDump, and the rest as binary blobs. Could that XML import-export functionality be integrated into WDump? except that all fields were imported/exported?