I've made this little program. It works with every version of every game, except for loom pcengine and mm nes.
http://hibernatus34.free.fr/scumm/scummtr.exe)
It's not very easy to use as i've been too lazy to make a readme. Feel free to ask me questions.
Oh well, maybe you'll also want to browse
http://hibernatus34.free.fr/scumm/)
scummrp extracts blocks and lets you replace them in the game files.
scummfont is a quick & dirty font to bmp & bmp to font converter (9x.LFL, 9xx.LFL, CHAR_xxxx). It *updates* a font, it doesn't create it.