Adding more function of Horizontal Stretch (H/S)

[core2]

Hello.

Is it possible add more function of H/S?

Currently blueMSX support Horizontal Stretch (HS2.PNG)

HS2.PNG (Real aspect ratio of MSX screen)
-->Shown default Border Left : 8 / Border Right : 8
(Pixel except border : 602 x 384 (Normal Window Mode)


Wanted the following H/S.

HS1.PNG (Show all border according to MSX Data)
-->Shown default Border Left : 14 / Border Right : 14
(Pixel except border : 576 x 384 (Normal Window Mode)

HS3.PNG (No Border is shown)
-->Shown default border Left : 0 / Border Right : 0
(Pixel except border : 640 x 384 (Normal Window Mode)

On MSX BASIC, The Range of SET ADJUST (X,Y) is X:-7~8 / Y:-7~8

http://www.mediafire.com/?owtmzc2xzzm

Other emulator implements H/S with set value.

At least I want to implement (add) more 2 H/S mode just like HS1.PNG / HS3.PNG.