I think this extension does pretty much what I want. I just have a few questions.

First is it possible to set different delivery days depending on the zip code of the client? For example if the client as a zip code of XXXX the delivery dates should be for example Mondays and Fridays, and if the client has the zip code YYYY the delivery dates should be Tuesdays and Thursdays.

Another question if it's possible to show different delivery dates available based on the type of shipping client chooses.

And yes I bought an early version of this to use on another website, and at that time I think a there were a few features that were not available that you claim they are not, this is why I'm enquire it agian and I will buy it again to use on a different website if this plugin meet the requirements I asked on the questions above