On the Baldurdash website, there is replacement for the dialog.tlk file, when you have BG2:SOA and TOB installed. I understand this basically expands the text detail in the game. If this is installed, is it then okay to install WeiDu mods afterwards - will they insert new text in the right places in the Baldurdash dialog.tlk file (if that is how it works)?

Thanks.

Yes, and that is, in fact, the ideal situation. Just always be sure to install any of the Baldurdash fixes *after* the official ToB patch and *before* any other mods.