Tried a few options but this one seems to work best.
By putting the shutter in a sub you can see what mode its in, if the shuter is closed it is in fade mode, shutter open it will be in dimer mode. And the blackout works.
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<personalities>
<manufacturer label="Modified" revision="1">
<model label="StarCloth - shutter in sub 5">
<changelogs>
<change username="Visual Productions" notes="Initial version" date="2007-01-01" time="00-00-00-00" />
<change username="" notes="" date="2013-05-16" time="00-19-41-84" />
<change username="" notes="" date="2013-05-16" time="01-07-40-98" />
<change username="" notes="" date="2013-05-16" time="11-52-21-78" />
</changelogs>
<sub>
<part attribute="Dimmer">
<range function="Control MSB" offset="0">20,231</range>
</part>
</sub>
<sub>
<part attribute="Dimmer">
<range function="Control MSB" offset="1">20,231</range>
</part>
</sub>
<sub>
<part attribute="Dimmer">
<range function="Control MSB" offset="2">20,231</range>
</part>
</sub>
<sub>
<part attribute="Dimmer">
<range function="Control MSB" offset="3">20,231</range>
</part>
</sub>
<sub>
<part attribute="Shutter">
<range function="On" offset="4">0,100</range>
</part>
</sub>
</model>
</manufacturer>
</personalities>