Cepstral Community

Anyone know of a workaround that would allow me to set the default rate for Miguel (spanish) when used as the default system voice on MacOSX 10.5? I tried to set it in the Speech control panel, but it seems to ignore that setting. A question to Cepstral support found that it's not a feature currently supported on MacOSX - but I am hoping someone has found a workaround that would enable me to set it?

Thank you!

Moises