Lots of users would like that possibility. Submit a feature request: Feature Request/Bug Report Form
For the moment, I think the best you can do is use a Custom Text variable and manually enter the date into that. You would need to edit the variable for each issue.
You can do this easily without script. Check out this sample.
First you can create a master spread with two text frames for the publishing date (A-master in my sample):
Then create some more masters based on the A-Master:
I added B, C and D masters and applied them to pages. (Don't apply A-master to pages)
Now the date appears on all pages.
When you need to change the date, you have to go to A-Master and do it only twice: for recto and verso.
I don't really understand what you mean!
As Peter and Kas said, just insert on master pages what you want as:
1/ Custom Variable: "0610"
3/ File Name Variable
5/ Automatic Page Number
For EPI file,
on page 1: 0610_EPI_1
on page 2: 0610_EPI_2
For EPIV file,
on page 1: 0610_EPIV_1
on page 2: 0610_EPIV_2
The only thing to do at the beginning of a new publication is to modify the "PublicationDate" variable!
Either way, your computer can't decide for you the date of publication! So you'll need to enter it somewhere!