as there have been some postings concernin how to sign a midlet, i'd like to give some positive response.
i am using wtk 2.1, nokia 6600 firmware 4.0.9
As i wanted to get rid of this quest, "do u want to install this software, it is not signed!!" i decided to pick the menu-entry
sign. There i created a new Key-Pair. After that i selected Sign.
All Done! The fingerprint has been added to the jad-file. I sent jad and jar file to my handy, installed it, NOW IT IS SIGNED!!!
good luck for u!!