could use
Code:
/target party
/cast some heal spell here
if I remember correctly each time yeh hit /target party it'll goes to the next party member but if yeh spam it faster then the spell cooldown it'll skip one.

or could do something along
Code:
castsequence target=party1 rejuv
castsequence target=party2 ,rejuv
castsequence target=party3 ,,rejuv
castsequence target=party4 ,,,rejuv

problems is if yeh start spamming that yeh will go oom real quick better off using wild growth not sure what level yer at.
another thing yeh might want to look at is having a healing key for each member of yer group .



with yers
Code:
/cast [target=party1, exists, help, nodead] healspell
yeh dont really need "exists, help, nodead" because all of these things have to be true in order for yeh to be able to casta healspell on someone