Maximum group audio delay is not enough

I think this is a feature request rather than support. I have a couple of enpoints in a grouped zone. One is a Naim Streamer feeding into a Chord MScaler / Hugo TT2, the other is a RPi4 feeding into a Chord Qutest. The problem I have is with the large amount of processing going on in the MScaler / TT2 that I can’t get the two to play in sync. The maximum delay I can set for the Qutest is 1000ms, but I reckon I need about 1200ms. A workaround is to put the Mscaler into Video mode, at which point 700ms (see image) does the job, but this reduces the benefits of having the MScaler.
Is this value something that could be increased ?