Hi there,
Just a little something but hopefully something to look into.
In the standard max bitmap mapping you can easily change the width size and then TAB to go to the height size. In the corona bitmap mapping you have to TAB three times to get there since it first goes to "tiling mode" then "height offset" and then finally to the "height size". I'm aware that it's logic behaviour but I think the default MAX tabbing makes more sense (never thought I'd say that though).