Solved! After toying here's how to do it:
useradd -G wheel -p <encrypted password>
where <encrypted password> is:
1- create shadow entry using passwd on linux box
2- tail the /etc/shadow and you'll see:
<userAccount>:$1$<string1>$<string2>:<numbers>:<numbers>

etc...)
3- Highlight everything from "$1$<string1>$<string2>"
4- paste this after the "-p" in useradd
5- escape out the "$"s using "\"
6- hit enter!
end result should be:
useradd -G wheel -p \$1\$<string1>\$<string2>