*W::
Send, {Shift down}
Send, {W down}
KeyWait, W
Send, {Shift up}
Send, {W up}
return
*A::
Send, {Shift down}
Send, {A down}
KeyWait, A
Send, {Shift up}
Send, {A up}
return
*S::
Send, {Shift down}
Send, {S down}
KeyWait, S
Send, {Shift up}
Send, {S up}
return
*D::
Send, {Shift down}
Send, {D down}
KeyWait, D
Send, {Shift up}
Send, {D up}
return

简单说，检测到wasd任意一个键还在按着的时候，不要抬起shift就好了。
就在shift up前加上一个判断
if !GetKeyState("b","p") && !GetKeyState("c","p") && !GetKeyState("d","p")
注意b、c、d需要根据相应按键修改，比如w里，这句的b、c、d就要分别改成a、s、d。