Yes, i agree with this, /var and /set should works with the same syntax and as for the equal sign, Om3m explain when you need to have one or not here :
https://forums.mirc.com/ubbthreads.php?ubb=showflat&Number=176028&page=2#Post176028

#mircscripting @ irc.swiftirc.net == the best mIRC help channel