I'm not sure it would be wise to add a fixpack onto BGT-WeiDU, but as Salk noted, there may be a few things that might be worth including into it. I wouldn't advocate a BG1Fixpack version to be installed on BGT-WeiDU, unelss the fixes were inside the BGT-WeiDU installation itself.
Unfortunately, EasyTutu has an initiative to have their Dudleyville set of fixes, so I am not sure Macready would support this either. Don't take this for granted though: let him speak for himself.
In addition, the Developer's Documentation for BGT-WeiDU lists and describes the changes for every BG1 fix made to BGT-WeiDU. This resource may be useful in implementing fixes.