Nope, I'm pretty sure you can use two different scrolling textures for the body as long as you also use the asymmetrical script.
material preset_#_bodyMatL
{
technique
{
pass
{
texture_unit
{
texture preset_#scroll.png
scroll_anim 1.0 1.0
}
}
pass
{
scene_blend alpha_blend
texture_unit
{
texture preset_#body.png
}
}
}
}
material preset_#_bodyMatR
{
technique
{
pass
{
texture_unit
{
texture preset_#scrollSECOND.png
scroll_anim 1.0 1.0
}
}
pass
{
scene_blend alpha_blend
texture_unit
{
texture preset_#bodySECOND.png
}
}
}
}
Hopefully that will help. It should work, I can't see why it wouldn't be working correctly. Maybe try changing your rendering system.