How much trouble would it be, leaving the main interface/playable region at 4:3, but allowing popup windows (player inventory, chests, etc) to be dragged outside the 4:3 region, for players with widescreen monitors?
It wouldn't be too hard if the screen was left-justified, with the remaining "black" area all to the right. But, to center the 4:3 game screen within the wide LCD monitor means the "x-axis zero point" would be somewhere about 100+ pixels to the right
of the left side
of the screen. This literally messes EVERYTHING up- mouse focus points, all graphic elements, etc.
It was an honest and simple mistake: when we designed the first engine back in 2005, it was done on a 4:3 CRT monitor. Shortly after we started, we thought "we'd better get an LCD monitor in here to test on"...and so we got a 4:3 LCD.
Now, all we have are widescreen LCDs here, but it's just too late to make the jump with this engine.