Print PDF-Letters: Enable Single PDF-Generation & Download

The feature to print PDF Letters is really great. However, in some cases (especially with huge data sets) one pdf-file containing all the letters is not what you want. Examples:

• Lettershops or other service providers may require one file per contact/letter
• if there is only a single mistake, you have to re-generate letters fo all contacts

Requirements

1. In the dialogue "Create Printable Letters" there should be an option to choose between "single files" and "one file"
2. if you choose "single files" a zip-file containing single pdf-files per contact should be created instead of one large pdf-file
3. [optional] The zip-file contains one sub folder per "number of pages" and the pdf-files are sorted accordingly

It would be acceptable for us (and maybe required) to use wkhtml to pdf. In that case a setting page to activate this feature may make sense.

Could you please make a rough estimate of the time required to implement this feature? Please do not put too much work into it - something along the lines of "1-3 days" or "5-10 days" would be sufficient for now.