Mounting many macro

Guides UI and Macro
1

the below macro it awesome the only thing I cannot seem to work out is the Shift mode.
If you are mounted on any mount it dismounts you and you have to click again to mount. I would love to figure out how to get the shift to behave like the rest, meaning If mounted dismount and mount my random favorite mounts:
#showtooltip
/dismount
/cast [nomod]Algarian Stormrider
/cast [mod:alt] The Dreadwake
/cast [mod:ctrl] Grand Expedition Yak
/run if SecureCmdOptionParse"[mod:shift]"then C_MountJournal.SummonByID(0)end

I have tried many different things but none work.

2 
#showtooltip
/dismount
/run if SecureCmdOptionParse"[mod:shift]"then C_MountJournal.SummonByID(0)end
/stopmacro [mod:shift]
/cast [mod:ctrl] Grand Expedition Yak; [mod:alt] The Dreadwake; Algarian Stormrider
3

sorry I already tried that and if you are on a mount and shift click the button it is dismounted and you have to keep holding shift and click the button again to mount

4

Ya, that’s just how the summon favorite mount command works.