One thing I would like to be able to do is to tell Picard to pad disc numbers with leading zeroes so that the disc number tag in all files of a release have the same number of digits. So if there are 110 discs, disc number tags will be 001 … 054 … 110.
I haven’t found a setting to do this. I presume it can be done with scripting, but I am not adept at scripting. If this isn’t currently possible, please take it as a feature request for 2.7.