[Rubini]

In SH5 the commands can have a line with a sound in the commands.cfg itself...an absent feature on sh3...but I guess that niobody have tried it yet.
So go on!
Here an example:

[Cmd66]
Name=Toggle_radio_messages
Contexts=1,15
Key0=0x4d,,"M"
Sound_0=ELO_Weapon,Mission_order <== seems that the sound needs to be on the sound\speech folder. You need to figure out the syntax first.

here another example with various sounds:

[Cmd192]
Name=Dive
Contexts=1
StringID=1030
Key0=0x44,,"D"
HasDelayedExecution=Yes
CommandClass=Depth
Sound_0=ELO_Helm,MC_CR_CHIEF_32,1030;Dive
Sound_1=ELO_Helm,MC_CR_CHIEF_34_A,7646;Deeper!
Sound_2=ELO_Helm,MC_CR_CHIEF_34_B,7647;Take Her Deeper
Sound_3=ELO_Helm,MC_CR_CHIEF_35,7648;Deeper Goddamit