What effect are you looking to get? Different combinations might not even need masks. And as far as I'm aware, you can have scrolling and glowing on the same pass, that shouldn't be an issue.
Second, the more effects / textures you stack and isolate with masking, the more passes you'll need if you have attributes that affect the whole pass rather than texture_unit attributes.
If you're looking for the general, all-purpose masking script, then use this:
material preset_1_headMatL
{
technique
{
pass
{
texture_unit
{
texture INITIAL TEXTURE
}
}
pass
{
scene_blend alpha_blend
alpha_rejection greater 128
texture_unit
{
texture MASK.png
}
texture_unit
{
texture MASK.png
colour_op alpha_blend
}
texture_unit
{
texture TEXTURE YOU WANTED MASKED.jpg
colour_op_ex blend_current_alpha src_texture src_current
}
}
}
}