Hmm. Some things are sometimes easier explained, or even more precise, in one form over the other. Is clarity a good enough reason to mix voices?

Consider:

"*Pages loaded into a browser from the domains listed in this variable are allowed to communicate with the login server directly.*"
vs
"*Restricts which domains a client can load pages from before interacting with the login server directly.*"

and

"*Controls whether the login server sends new users a welcome email*"
vs
"*Welcome emails will not be sent to the user if this is set to false.*"