Your correct but I never seen anybody that needed to modify the ipsec settings. Either way you need to do it old school and i advise to backup the cfg b4 making changes.
1: backup the cfg
Preference > General > Backup ( name the file )
2: open the <*.conf> file in yoru favorite editor.
3: Search down to the ipsec or connection name
4:make your modifications and save as new file
5: Restore the new cfg
<name>socpuppetshq</name> <type>manual</type> <ike_settings> <prompt_certificate>0</prompt_certificate> <description>MainFGT100D</description> <server>192.0.1.1</server> <authentication_method>Preshared Key</authentication_method> <auth_key>Enc 420d2ee65abded897a69c50f49954d0df61920558d173d22a1b0b1b058b8034b</auth_key> <mode>aggressive</mode> <dhgroup>5</dhgroup> <key_life>86400</key_life> <localid></localid> <nat_traversal>1</nat_traversal> <mode_config>1</mode_config> <enable_local_lan>0</enable_local_lan> <dpd>1</dpd> <xauth> <enabled>1</enabled> <prompt_username>0</prompt_username> <username>Enc 420d2ee65abded897a69c50f49954d0df619498b1925dd2d993abf54be</username> <password>Enc 420d2ee65abded897a69c50f4995397969f1c1f949055d8e51</password> </xauth> <proposals> <proposal>aes128|sha1</proposal> <proposal>aes256|sha256</proposal> <proposal>3des|sha256</proposal> <proposal>aes128|sha1</proposal> <proposal>aes256|sha1</proposal> <proposal>3des|sha1</proposal> </proposals> <fgt>0</fgt> </ike_settings>
I hope that helps. Just becarefull and ways make a backup copy b4 proceeding.
Good luck and let us know how your forticlientVersion works. I'm having problems with a few 10.10 and dropping ipsec connections.