I found a command line solution to creating mailman lists for ISPConfig virtual domains.
newlist -e domain.com -u www.domain.com
Also it seems that I had to add the following entries into main.cf for postfix and mm_cfg.py for mailman.
I am sure there should be an easy way to integrate it into ispconfig install and/or have ispconfig web portal alter these settings.
alias_maps = hash:/var/lib/mailman/data/aliases
virtual_alias_maps = hash:/var/lib/mailman/data/virtual-mailman
POSTFIX_STYLE_VIRTUAL_DOMAINS = ['domain.com', 'domain2.com']
Any case I know absolutely nothing about web design so I thought I'd ask for a feature add/request.