I have some ideas for additions to the interface that I think might make the relay browser more pleasing to navigate as well as increase the OCD factor from major to institutional.
The current listing method list everything at once which is not bad if you are dealing with a small intergration, but when you are revamping or add 100+ files at once it can become a mess. Having the ability to control what is actively displayed by type at any time would be extremely helpful.
One easy enough way to implement this would be to have a simple sorting mode based directly on your current existing "actions" available for each file. This would allow a user to display only items capable of being pulverized without having to jump back and forth between two different types of item handling. The same can be said for some of the others, i.e. use, items with no sell restrictions, etc...
On the note of items locked out of sell, trade, smash, combine, use, or anything else useful; couldn't there be a quick option for either closeting them or display casing them just to get rid of them? Since that is non-destructive and most anyone who uses this script would have more than likely made sure that they already safely set "keep all" to their items of the same type that they use in EQ sets or for anything else.
The last thing is less to do with your script and more to do with the add-on script(i think), but as far as i can tell if can be run by either. The newest versions of kolmafia have already added listings for the smash results of basically everything in their item manager. The current system of using an svn to connect to for each item, one by one, is not very streamlined at all. Not even getting into the fact that the svn is not always up, and that it has a database which isn't large descriptive or correct all that often, kind of kills the point of it at all.
When sorting items and figuring out if you need to save, smash, autosell, mall sell, craft, etc... you need a bunch of different data on the item to make a proper assessment. I'm sure you know all of this since you made this script like it is in the first place. While it is an improvement, a vast one on the current system, without that extended functionality it feels like it has lost quite a bit of it's appeal.
Sorry for making a massive rant post, and don't get me wrong I really like your script, it is the best I have seen of its type, including kolmafias item management interface(too cluttered). I just figure when someone takes their time to help everyone else out the least we can do is give constructive feedback ^^