just ideas:

autocompletion
enchant support
broken links checking
aspell support for Win32
screenshot function
remember wrap setting //add to the triplex field
comment the selection
gallery generator with thumbnails 
add threaded gauges for time-consuming operations
Highlight all search results 
size/pos profiles
gradient colorization in palettes
"entity to html" function
fm::insert the file list to the text
fm::detect the charset for the selected file
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 asm, Lisp, Perl
ZIP the directory?
Unzip selected archive
units conversion
PDF text reader
smart indent/unindent
