Integer scaling out of screen bounds in MAME ? (not RA)

[Xyga]

Yo!

Anyone knows if there's a way, in MAME builds out of RetroArch, to do integer scaling by desired factors (2x, 3x, 4x, 5x, etc) even if that brings some of the ficture out of screen bounds ?

In RA that was called 'custom integer scaling' last time I checked, very convenient to get a big clean picture on my laptop (1600x900 screen -> 3x factor looking good a the cost of a few lines lost top and bottom).

RA is good for using at home on a bigger display, shaders and stuff, but when I'm away and only using my laptop to play I just freaking hate it's shitty UI and constant need for damn cores and rom updates...