[badwolf]

IIRC what I did ages ago was the following:-

This is the setup after installing SH3.

[Cmd4]
Name=Time_compr_reduce
Ctxt=1,2,6,9
MnID=0x3F010004
Key0=0x6D,,"Npad -"

[Cmd5]
Name=Time_compr_increase
Ctxt=1,2,6,9
MnID=0x3F010001
Key0=0x6B,,"Npad +"

Now I believe that when a command is sent it looks at the 1st,2nd,3rd....Cmd.
Now we want it to see the Cmd 5 then 4 for it to work properly, So we swap them over to this.

[Cmd4]
Name=Time_compr_increase
Ctxt=1,2,6,9
MnID=0x3F010001
Key0=0x6B,,"Npad +"

[Cmd5]
Name=Time_compr_reduce
Ctxt=1,2,6,9
MnID=0x3F010004
Key0=0x6D,,"Npad -"

Then we add our commands. Lets say we have full TC is x2048

[Cmd4]
Name=Time_compr_increase
Ctxt=1,2,6,9
MnID=0x3F010001
Key0=0x6B,,"Npad +"
Key1=0x6F,R,"NumPad *"

[Cmd5]
Name=Time_compr_reduce
Ctxt=1,2,6,9
MnID=0x3F010004
Key0=0x6D,,"Npad -"
Key1=0x6A,,"NumPad *"
Key2=0x6A,,"NumPad *"
Key3=0x6A,,"NumPad *"
Key4=0x6A,,"NumPad *"

When you press * key once.
[Cmd4]
Key1=0x6F,R,"NumPad *" increases to TC x2048
[Cmd5]
Key1=0x6A,,"NumPad *" decreases to TC x1024
Key2=0x6A,,"NumPad *" decreases to TC x512
Key3=0x6A,,"NumPad *" decreases to TC x256
Key4=0x6A,,"NumPad *" decreases to TC x128

This happens very fast so you only see it jump from TC x1 to TC x128.

NOTE: It was ages ago when I did this so can't say how it performed, but just experiment.