I remember a while ago I used an addon for Wrothgar world bosses, and it allowed me to use multiple strings but required activation through the addon, in addition to editing the LUA files with the specific strings as there was no menu. I think it was DailyAutoShare. I don't remember how I did it, but look through the comments and see if you can find any that I wrote there. They'll probably hint at what you should edit.
Edit:
It's actually in the addon WPamA (What Pledges at my Alts).
The solution is on this page:
http://www.esoui.com/downloads/filei...age=5#comments
This was linked to Wrothgar world bosses and has to be started using the addon in Wrothgar. I don't know how you'd change it to allow for dolmen farming, but at least it's a start.