I might be a bit late here, and I could be completely wrong, but...
isn't it possible just to in inc_func_common.asp, around line 1200 add a bit of css to the end of the image tags?
ImgTags(1,1,2) = "<img src="""
ImgTags(1,2,2) = """ border=""0"" style=""max-width:600px; max-height:400px;"">"
set the max width and height to whatever you fancy, and then do the same with all of the image tags?
I haven't tried this, but I reckon it ought to work.<