Twitter Tools mod – change agent name?

Is it possible to change the Twitter agent name to a custom name?
I am using the Twitter Tools by Alex King, and was wondering if there is a way to change the name of the ‘device’ or ‘agent’? (if thats the right word) from where the tweet originated. I tried to change some things in the PHP but couldn’t get it to work.

I am trying to change it from this:
28 minutes ago from Twitter Tools

To something like this:
28 minutes ago from CUSTOM NAME HERE

Any help would be appreciated – thanks!