If you manage to register a new account in miranda, using the provided tool - yes, it can communicate with people that use mobile, no server list though - you will have to add their numbers manually in search and then add them to permanent list.
first thanks for taking the time to moderate the topic and thanks to the author for this great plugin
now: I wasn't going to ask but since you said it...
I'm trying to add users manually using the find/add contacts. I paste the Whatsapp ID: ###########@s.whatsapp.net then I hit search and nothing is found, then I click on add to list, add the new name but when I click on "add" nothing happens, the contact won't add, perhaps I'm doing something wrong, could you shed some light on it please? the only way I can add users is if another other sends me a whatsapp message. then I hit add permanently and it allows me to click on "add"
EDIT: I finally managed a way to do it. simply by replacing the id of one of the users I already have on my contact list on the "profile".dat file, then logging in and replacing the old name for the new one, don't try replacing it on the same profile.dat file or miranda will crash. this way I have been able to add several users. maybe there's another way but now this one does the trick, thanks anyway.