False. That sentence saying that VMPK does not allow several computer keys to be mapped to the same MIDI note is not true. Totally bullshit. It is very easy to speak quickly without trying to verify the facts. Or perhaps it is the fun on spreading FUD and lies.
This question has been debated, answered and explained several times. For instance:
Forum discussion: Mapping multiple keys to the same note
Feature request #31 Same Note value for Multiple Keys
To summarize: the keyboard mappings are stored as XML files. You can edit the XML files with any text editor you want, and load the files using the "preferences" dialog. There are two types of keyboard mappings: based on characters and based on keycodes. The files of the first type should be adapted to each language layout. The files of the second type depend only on the operating system, are language independent, and allow to map "dead" keys (diacritics) which the character based maps are unable to do.
Examples of both types:
Language: German. Based on characters.
Windows (language independent)
If you look at the German mapping, you may notice that there are two keys mapped to the MIDI note 33 (lines 22 and 39). Both files have been shipped with the software since day one.
And there is a dialog window in the program to edit these files based on MIDI notes, which is very easy and convenient for 99% of the users. Because this editor is a simplification, you cannot assign more than one key to each MIDI note with it. But it is enough for so many people that if you are one of the few users needing more sophistication, then you need to make the effort of grabbing your text editor and using your brain a little.