As far as I know, adding users manually is the only way, but I am still running 1.1.x.   Ideally there should be a project menu available for each user account when you manage users. 
 
Are all 140 really active right now?   Maybe just start by adding all 5 to the most used projects.  As you know you can add them at once using "Manage Projects".
 
Sorry couldn't help more.
KM
From: Jon Hardcastle <Jon@eHardcastle.com>
To: mantisbt-help@lists.sourceforge.net
Sent: Wednesday, January 30, 2013 4:27 AM
Subject: [mantisbt-help] Adding a user to multiple projects

Hi,

Quick Q we are using Mantis 1.2.4

I have had a request come in for 5 new users to be added with 'the same projects as me' where they are in 140 projects.

Traditionally I'd add them manually - but that is too many projects for too many people.

Am I missing the 'Clone User' or 'Copy projects from x' or add all sub projects button?

--
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N: Jon Hardcastle
E: Jon@eHardcastle.com
Q: The avalanche has already started. It is too late for the pebbles to vote.

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