Can I distribute a signed .jad in .sis (as in FAQ-1219)

Hi,

What can be done to achieve same level of automation while distributing a 
_signed_ Midlet (.jad/.jar) inside a .sis as in the FAQ-1219 (Can I install 
a MIDlet using a SIS file?).

For reference, the faq suggests using FILEMIME (FM) tag as in the fiolowing 
sample:
  ;MyMIDlet.pkg
  #{"A sample MIDlet"},(0x010000009),1,0,0

  ;Supports Series 60 2.0
  (0x1020216B), 2, 0, 0, {"Series60ProductID"}

  "HelloWorld.jad"-"D:\temp\HelloWorld.jad", FM, 
"text/vnd.sun.j2me.app-descriptor"
  "HelloWorld.jar"-"D:\temp\HelloWorld.jar"
This works fine with an unsigned code.

Following the same pattern with a signed midlet, the installer gets over the 
.sis, then starts to install the .jad but eventually evaporates without 
finishing the process (on Nokia N70).

Does someone have a clue ?

Sergey