just ideas:

batch-обработка картинок: обрезка, масштабирование, поворот, зеркало?
поиск по - начинается с, заканчивается на //есть регэкспты, лишнее?
hunspell at win32
при закрытии календарной записи будет автоматический возврат на панель календаря
autosave bookmarks?
autocompletion
broken local links checking
remember wrap setting //add to the triplex field
Highlight all search results
gradient colorization in palettes
"entity to text" function
new image viewer?
autoscroll //useful for musicians. define the speed in bpm?
numbers into words
ctags support
make max recent items user-modified
hl for gas, Lisp
ZIP the directory?
units conversion
PDF text reader
add function to update hls cache manually
unicode table window
split document panel
ANSI art support
play the chords by name, i.e. select AmDm, then use something like "Play melody"
chords to tabs, heh heh
parse the compiler output, goto the error by clicking at logmemo
0-9 markers
multiply files charset encoder
goto start/end of the code block
PalmDOC (pdb) read-only support? http://wiki.mobileread.com/wiki/PalmDOC, http://www.hotpaw.com/rhn/palm/pdb.txt
epub support
CSound hl
gz file save?
select code block

планы:

использовать libretta::CPainFile вместо QSettings