Personally I would not recommend allowing access except for special cases (if that even) or unless you have a properly jailed system so that users can not go outside their home directories using ssh.
From other threads I thought that DA and jails (FreeBSD specifically) did not get along or is it that it is not automated but you can setup jails manually?
DirectAdmin does not jail the system by default, but it can be done manually. There was a thread on this awhile ago (Why DA didn't), and if I recall correctly it was because they didn't have enough live servers testing it, however I think the script is still availabe for download.