Question on two Feral macro's

[Miast]

I'm at work and just typed these up from memory so excuse any typo's. My question is why does the first macro require one key-press and the second requires two? What's the difference?

/Cancelaura [mod:shift,form:1/3] Enhanced Agility
/Use [mod:shift,form:1/3] item:58145
/Use [form:1/3] 13
/Cast [form:1/3] Berserk(Cat or Bear Form)

With Shift it will cancel "Flask of Enhancement" and use "Potion of the Tol'Vir" first.

/Cast [mod:shift] Savage Roar(Cat Form)
/Cancelaura [nomod,form:1/3] Dash(Cat Form)
/Cast [nomod,form:1] Stampeding Roar(Bear Form)
/Cast [nomod,form:3] Stampeding Roar(Cat Form)

This one allows me to cancel dash if I get rooted while it's still up.

[Deleted]

Not being able to overwrite a buff with a more powerful buff is a server-side restriction - the client will always send the "attempt to use item" packet to the server.

Not being able to use SR/Dash at the same time is a client-side (as well as server-side) restriction - the client will not realize that you have cancelled the Dash buff until after the macro finishes.

[Miast]

Ok I get what you're saying. There is really nothing I can do about it then. Thanks for the help!