I was searching on how to bind my mouse wheel to weapon changing in Blood. I finally found a way on how to do so. Get autohotkey and create this script:
#ifWinActive, ahk_class SDL_app

*WheelUp::
SendEvent {Up Down}
Sleep 200
SendEvent {Up Up}
Return

*WheelDown::
SendEvent {Down Down}
Sleep 200
SendEvent {Down Up}
Return

This will bind your mouse wheel to the up and down arrows. Also, this script will only be on when your dosbox is the active window. I'm not sure how to change what keys the mousewheel is bound to; if you find out tell me :).

Big thanks to Code120! Here is the thread I found his script on: http://vogons.zetafleet.com/viewtopic.php?t=27517&sid=b0c55d85737e9184e1f2254cac39c754

That's great news. final513, was also looking for a way to do this.

Thanks for the tip. It works very well for me. And I think you can change to other keys like this:

=============================
#ifWinActive, ahk_class SDL_app
*WheelUp::
SendEvent {key1 Down}
Sleep 200
SendEvent {key1 Up}
Return
*WheelDown::
SendEvent {key2 Down}
Sleep 200
SendEvent {key2 Up}
Return
=============================
simply change key1 and key2 to the name of the key you want to bind, e.g. Enter, Space, etc. List of key names valid for Autohotkey can be found in its help file. Here is some of them:

CapsLock=Caps lock
Space=Space bar
Tab=Tab key
Enter (or Return)=Enter key
Escape (or Esc)=Esc key
Backspace (or BS)=Backspace
ScrollLock=Scroll lock
Delete (or Del)=Delete key
Insert (or Ins)=Insert key
Home=Home key
End=End key
PgUp=Page Up key
PgDn=Page Down key
Up=Up arrow key
Down=Down arrow key
Left=Left arrow key
Right=Right arrow key

Thank you for the help! It has been a while since I've played but I could hopefully get back into the game soon. Hey if you ever get back on I would be glad to help. Drop me a message or reply to this one and tell me what exactly is goin on.

Thx, I'm gonna give it one more shot actually and we'll see. Damn program wouldn't work.