this could be totally wrong for SOF2 (as far as commands), but a good bet would be to use an alias..

for instance:
if i wanted to make a key that turned on something only until i released the key, all I would have to do is something like this:

alias +showframes "cl_showfps 1"
alias -showframes "cl_showfps 0"
bind F11 +showframes

A toggle key would be like this:
alias showframes0 "cl_showfps 1;bind F12 showframes1"
alias showframes1 "cl_showfps 0;bind F12 showframes0"
bind F12 showframes0


The "+" before the "showframes", in the first example, is basically telling the game that "showframes" is not a toggle key.  For example, when you hold down the 'attack' button you keep attacking until you realease it... this is because your mousebutton is bound to "+attack"  
When you release the mousebutton the command "-attack" is executed automatically...  The reason you dont see a "-attack" in your config file is because the command "attack" is an actual command, with either the attacking or not attacking state.  
However, with this:

alias +showframes "cl_showfps 1"
alias -showframes "cl_showfps 0"
bind F11 +showframes

You DO have to define the "-showframes", because the command "showframes" is not a command... Its just the name for a command, or a set of commands... (poorly explained, i know)

Anyways...
Using the same idea, a jump/crouch command could be made..
+moveup = jump
+movedown = duck
-moveup = brings you out of the jumping state
-movedown = brings you out of the ducking state

alias +jumpduck "+moveup; +movedown" <-happens when you push space key
alias -jumpduck "-moveup;-movedown" <-happens when you release space
bind SPACE +jumpduck

(note: this may or may not work, I have not tested in this game)

With that as a guide, you should be able to figure this one out yourself...
later

I don't know crap about sof2 commands, I was just ASSuming that an alias would be the way to go... too much quake2 engine scripting i guess.

thanks for the tip about the toggle command, ill have to try that in savage.  

Its ok dudes!
I have find out about this. THANKS!! anyway all of you  

Something else what i want to know it is that is it any script
for mirc to use it that i can see info for my sof2 server ?
eg: map, players, says etc. etc. etc.

Do someone knows something about it ?
Thanks to all of you