He contactado con ellos preguntando si el teclado soporta presionar 5 teclas a la vez (por lo del truco VICTOR de Abu Simbel), aquí la respuesta:
The following is our standard answer regarding phantom keys and rollover:
Given the way we connect our switch matrix, our statement about phantom keys and rollover is, unfortunately, complicated. Our keyboards meet and exceed the Microsoft and IBM standards for multi-key combinations. Our keyboards will support any one to four modifier key combination (Shift, Control, Alt and/or GUI keys) plus a fifth key as long as:
1) No Left+Right modifier keys (Left+Right Shift, Left+Right Control, etc.) are involved in the combination, and
2) Neither the Up Arrow, Pause key, nor the Caps Lock key are the fifth key.
Our original intent was to support multi-key sequences required by any Microsoft OS or Application and to the best of my knowledge, that's still true. Of course our keyboards will support other key combinations larger than five key sequences without generating a phantom key situation and there are some 3 key sequences which will generate a phantom condition. Consequently, it's difficult to make a generic statement beyond the one above.
As for rollover, the USB HID and boot protocol standards limit our USB keyboards to six key rollover. The buffer sizes and key processing in our PS/2 controller limit those keyboards to 7 or 8 key rollover.
Thank you for your inquiry and interest in our keyboards.