ok ;))
i don’t know if it help, but i found [http://www.ogre3d.org/wiki/index.php/Hydrax
|this ocean simulator] for ogre. It calculates some stuff, and the caustics too, but, if you download it and take a look of it you can see that they use a bitmap sequence as animated map. This could be a solution (and they caustics texture seems good enough, it is tileable perfectly and it loops perfectly). Not an elegant way, but probably the result will be good. I haven’t tried it yet, but i will test it soon ;)
the direct link of the sources of this plugin for ogre is this
Inside this rar you find the animated texture in this path:
Hydrax-v0.5\Hydrax\media\Hydrax