Hey,
I would like to set the display options very differently for Horizontal and Vertical games in MAME32. I've tried right clicking on the horizontal and vertical folders in the GUI but can't access the properties tab. I have a vertical monitor and I play horizontal games at a 3:4 aspect ratio so my set ups are very different depending on the orientation.
Right now it seems like my only options are either the default option or to set up each game. I've tried using the AVGA res tool but it doesn't work that great for vertical monitors when using the card's native driver rotation options.