• The waveform starts and ends too close to the window frame
• Loading more files while already editing one and they and also the "loading alert window" are topping your file, disturbing and bungling your work ... instead of loading into background.
• No usage of "Pos 1"/"End" key or something similar to jump to the beginning or end of a wave
• How to fiddle the cursor to the exact end/beginning for e. g. inserting? Zooming in, set, zooming out? Why no shortcut?
• No possibility to get rid of unnecessary formats like µLAW, AVI and QT movie?
• No possibility to preset the desired output format, which causes much additional efforts on working with many files. Otherwise something like Alt-Cmd-S would be enough to save it in that format and Cmd-S to save it in the original format.
• And Amadeus gets slow as hell if you are working on more than one file and try to edit one while the other is loading or saving, or when you try to save 3, 4, ... files, you have to wait long time. Something like a "Save all" (to original and to "set for output" format) would be fine. Then you could do something else instead of waiting minutes until the last save-dialog appeared.
• No shortcuts for many functions
• No possibility to collect ones main functions into a toolbar and/or address shortcuts for them?!

Amadeus crashes on saving files with long names, at least with bigger (50 MB+) files.
The shortcuts for fade in/out don't work at all.

Now it's up to you!