Audiosync limitation of audio delay

[Alexwilmac]

Hi, I've always used this very useful plugin. I don't know if what I'm going to report is a bug or a limitation impossible to go over: the issue is that it seems impossible to set delays higher than 525ms.
If you go over this value, at first the audio disappears. Then, at about 975, it comes back but it seems that the actual delay is not what you set and it is between 0 and 525.
This issue it's a real pity because there are many TV sport programmes, for instance, where there is an anticipation in the audio track and this causes to get comments before they happens. This is very, very annoying and I hoped that audiosync might solve this issue. Only, 525ms is too few because sometimes the audio anticipation we have to compensate is also of about 2s.
Thanks and regards.