Scripter access to Marks/Variable Text

[Gibbz]

I'm looking at doing a mail merge type scenario with product prices in the catalogues I produce. As the pricing changes regularly I thought I could use the Marks Manager feature to insert the prices, and use a script to update all the prices from a spreadsheet.

Is there any way to access the Marks via scripter?
I basically need:
1. access to the list to search by the name, and a way to edit the text to insert field
2. a way to edit the name, insert and delete items would be a bonus.