Hi,
When using a custom script int he Rename dialog, is it possible to somehow preview the SetAttr changes in the columns like you currently can see the old and new name column? For example when using something like (SetAttr META ""tags: " & tag & """"), is it possible to have a column display Tags and New tags?
Scripts can output text to the output window below the script editor in the Rename dialog. More advanced scripts can even create their own windows to display information.
However, you should be very careful when using scripts in the Rename dialog which have side-effects. The scripts will be called every time the Rename dialog's preview list needs to be updated, so those side effects will be applied a lot, to at least some of the files (e.g. the ones visible in the preview list). It may not be the best idea to use the Rename dialog for that.
(Scripts can be run outside of the Rename dialog these days, from Opus 10 and above.)