Hello Mikaël,
the waptconsole.exe binary is integrated by default into the WAPT agent, so if the client machine has the WAPT agent installed, the console is available. However, there is no icon in the Start menu. Your colleagues can find and launch it directly from the directory c:\program files (x86)\wapt\waptconsole.exe.
Regarding signature keys, it is strongly recommended to have one per system administrator, but if you are still learning, you can start with just one key. Indeed, many of the problems that first-time WAPT users encounter are related to certificate mix-ups.
Once you're comfortable with the process, you can create a certificate for each admin. Then you need to deploy these certificates to the machines that each person will administer (for example, the server admin's certificate is deployed to the servers, the workstation admin's certificate to the workstations, but not the other way around).
Note: I'm referring to a key and a certificate because there are actually two: a private key that remains on the admin's machine (remember to make a backup

), and a public certificate that goes with the key and is deployed to all the machines that will be managed with that key.
Sincerely,
Denis