FYI (I'm sure you already know), in the Property Groups selection dialog (where the green arrow points), you can drag selected modifiers up/down to re-order them (in the same way you can with ordering Menus and such), but it doesn't "save" or have any effect.
And it doesn't matter which order you put modifiers in... they get scrambled somehow - I'm not sure how the order is being selected (it isn't even alphabetical, which I could live with by using Numbered Modifier Names). I have a bunch of products with many modifiers entered already, and almost all of them have a messed up sort order. It might be nice too to have the Modifier selection list ordered at least alphabetically - instead they appear to be ordered based on their creation date/time (probably ID ?)
If the Property Groups selection dialog would save the order somehow, or at the very least honor the [Order] column in the table, or sort alphabetically, I could work with it and be happy.
P.S. As a background, I spent the last 2-3 weeks installing, trying, evaluating 20+ POS programs of all sorts: FREE, almost Free and Extremely expensive. While some of them can be feature rich, they are almost always cryptic to set up and/or expensive to buy. While I found SambaPOS a little strange to set up in the beginning (all the programs have a different way of doing things), and there are features I'm still learning to use, I recognize the POWER built-in to SambaPOS (a quick search through the Forum facilitated my Happy Hour set-up in minutes). The things I liked the most though (in no particular order) are: Price, Usability, Built-in features, Open Source, Actively Developed and Supported, Quick response here in the Forum, NOT Java - instead C#, MSSQL (MySQL would be good too). I love the Triggers, Rules, Actions approach - Powerfully Ingenious IMHO.