Perhaps make it so that the key input is directed immediately to the pattern editor instead of to a textfield? (put in a useless smiley image just to have a pretty sight)
Updated the first post to add 0.6
This one also allows you to use the arrowkeys and tab/shifttab to browse through the tracks, lines, notecolumns to quickly change.
The purpose of 2,5K is that it should lure people in browsing and figure out how many of this less code could do all that kind of stuff.
Even if you are no programming wizard, some of the stuff can be done very easily. But reading the API to find what you need consumes the most time.