When creating munge processes, give the user the ability to preview some of the data and see what data transformations are occurring. This would help the user when they are developing their munge processes; to ensure they are matching based on what they think they are matching on.
For example when creating a munge process such as the one in the attached file. The user would be able to click on the Retain Characters plug in and preview the transformed input data.
We love this idea... in fact, we've been planning it from Day 1.
The only thing stopping us is lack of available time. Due to other projects competing for our resources, we will not be making any material improvements to the MatchMaker until at least September.