Can't modify image dimensions in flash web export

I need some help fixing an issue that I guess isn't a bug, it's just not what I want my output to look like.
When I export the basic flash web gallery with a mixture of vertical and horizontal oriented images, the default settings render my vertical images to the same height as the horizontals, ie if a horizontal image ends up as 800x500 (width x height) the vertical ones all come out 500 high, making them a very tiny 500x300 (or whatever). As I say, this seems to be what it's supposed to do, I just don't like it! It's a pet peeve of mine that monitor aspect ratios oblige us to display portrait smaller than landscape, and I'm determined to make the most of what little space there is.
I've tried messing with the style.xml settings, the module advanced options (which are the same thing AFAICS) and trawled the net all afternoon to find a way to get vertical image height to fill the available stage area height. I have noticed that LR seems to export from the Develop module fine (in this respect) if I set the export dimensions square, so setting 800x800 forces an images longest edge to 800px, ie the same size irrespective of image orientation. But because there's no equivalent option in the Web module (just large, small, etc) this little trick isn't possible. Am I explaining this clearly enough? By my reckoning, editing the xml file is too late: the web module has already exported the vertical images with the "wrong" long-edge dimensions.
Surely there's a way to force web output to a orientation-independent common size? Or do I have to export verticals and horzontals separately? The simpleviewer engines all manage this just fine, so I'm hopeful there's a simple workaround. I still have a couple of days (and most of my hair) left before I need to upload this stuff & would sincerely appreciate some help!
Running LR 2.3 on a MacBook / 10.5.6.
Thanks for reading.
Mick.

Thanks for the reply, but I don't think this has anything to do with fixed size galleries. As I say, the fact that Simpleviewer flash output doesn't constrain the height of vertical images to that of the horizontal ones suggests that it's not even a quirk with flash engines, it's something peculiar to LR Flash Gallery code. I suspect it's something missing from the <mediaPosition> section, but I'm not sure exactly what...
The Simpleviewer gallery.xml usually gives you this sort of parameter:
maxImageWidth="800" maxImageHeight="800"
and you get vertical images scaled to the max height of the stage (even if it's never quite 800px) – that's all I'm looking to hack the LR Flash Gallery xml with. I want to know why, when I enter
height="800.00" width="800.00"
in the <mediaPosition> section of the style.xml, I end up with the height at 600 or less, regardless of stage space.
Looking at my output sizes, LR appears to generate a set height for all images, scaling the width to fit, but not the other way around. Cue exasperation.
There has to be a way to do it. Since I posted the question I've found a couple of things. First, it is possible to force a set image height, but you also need to set a fixed image position. The default xml code is usually somerhing like
<mediaPosition videoScale="upDown" positionType="auto" fitAtStart="true" height="264.00" imageScale="fitToScreen" x="0.00" y="0.00" width="360.00"/>
but if you change the positionType, imageScale and fitAtStart fields, giving the image area a fixed loaction (x and y coordinates) it's possible, with a load of messing on, to generate a slideshow which behaves the way I want, but the thumbnail view remains the same:
<mediaPosition videoScale="upDown" positionType="fixed" fitAtStart="false" height="770.00" imageScale="fixed" x="180.00" y="90.00" width="960.00"/>
This might even be ok, but it behaves differenty on different monitors due to varying aspect ratios, so it's no good. I feel like I'm 'close but no cigar' here. If anyone knows better I'd love to hear it.
I also found a LR plugin that looks like it might get close enough to the LR Flash output that I want, and as it's just $35 I might have to go for it: http://slideshowpro.net/products/slideshowpro/slideshowpro_for_lightroom
I'd still much rather stick with the original engine, if anyone can point me to a solution.
Thanks
Mick

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