Currently, the transaction log features a bunch of proxified http requests which is really awesome :)
This said, a number of relatively small changes will make a huge difference in usability:

1. More pagination options would be nice: For example, 1k, 2k and/or a textbox where the user can type whatever.
2. The response size is a CRITICAL, currently missing column: Sometimes this is the only useful indicator for custom 404 pages that return 200 OK codes.
3. The timestamp is also important and should be displayed on the left
4. The column names should sort when clicked, this would be very useful to see slower requests, sort by URL, etc. cumulative sorts -if easy- would be even more awesome :)
5. Optionally something like ZAP has on the "Tags" column would be nice (maybe we can do this later): In ZAP this features useful summary words like "comment, password, etc."