Here is my modification of the theme. I prefered the operation where the doors worked as expected based on the SH4 manual without remapping ANY keys. In the following changes I used what others have suggested, but instead of changing other keys to map to SH3 functions, I kept all the SH4 keys and made the "w" key do what it's supposed to... CLOSE the selected door, but ONLY when you want it to:

;[Cmd309]
;Name=Close_torpedo_tube
;Ctxt=1

[Cmd311]
Name=Close_sel_torpedo_tube
Key0=0x57,,"W"
Ctxt=1

;[Cmd312]
;Name=Toggle_open_close_torpedo_tube
;Ctxt=1

[Cmd323]
Name=Cycle_torp_tube
Ctxt=1
;Key0=0x57,,"W"
;Key0=0x59,,"Y"

Now you can cycle open all the tube doors with Q and they stay open until fired, and close any doors you want with W. Thanks to all those who have worked on this fix. Essentially there is no key assigned to 323 so the W key works.
-Pv-

Yeah, thats what I did to make it work too.

Thanks for all the kind comments.
I'm happy to have contributed something for a change.

I use the "Y" key all the time but found it a pain to have to cycle through all fore and aft tubes,so I've now changed lines 324 and 325 to read:-

[Cmd324]
Name=Cycle_fore_torp_tube
Ctxt=1
Key0=0x59,s,"Y"

[Cmd325]
Name=Cycle_aft_torp_tube
Ctxt=1
Key0=0x59,c,"Y"

Just by putting the cycle key (Y) between the " " marks you can cycle through either the fore or aft tubes using "shift+Y for the fore tubes or ctrl+Y for the aft tubes.

Excellent Post Bute

Hi Buteobuteo,

Hopefully you don't mind - really enjoying the mod and I'm planning to put this into my Keyboard Function 1.2 release shortly. With due credit :yep:

Of course not. I was hoping you would anyway.

Until the Impact/Magnetic Exploder button is fixed,I've mapped a key thats not used to [Cmd329] I use the "F" key. By using it just before firing each tube I don't have to worry about the stupid thing.
I don't know if it's worth including,if no-ones already thought of it.