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As long as you have ajemti-v installed it will be under ftp tab in manage section for "websites" 
Ajenti is on GitHub, feel free to fork it and start creating Wiki articles.  Being as though he is the only developer working on this and it's being given out for free, documentation is normally on the back burner as there are bugs, and features that would be considered higher priority.

:) I'm just sayin...
What type of module were you thinking of?  I've developed numerous WHMCS addons and it would be easy for me to develop one, but all depends on what features you would want ...

Right now what we do is just deploy images with Ajenti already installed on them, and the user just selects the template when ordering.

Not really sure what benefit would be of having a WHMCS module, but let us know and if it's something that would be feasible i'll consider creating one.  Open source of course ...
You can probably look at setting it up, or maybe even use Afterlogic webmail, but there's nothing integrated that I know of.  The mail plugin was just recently released for the ajenti-v so it may be a little while before that's added.
Maybe would be good to start a kickstarter campaign to get contributions to help pay you to be able to work on it more or even hire someone to help...

I know one open source project I work on, Observium, the dev started a kickstarter campaign for help support him focusing full time on the project to make alerts, etc, and he raised even more than he planned on.

Just a thought .... I know I 100% would donate.  Unfortunately time is one thing i'm short on otherwise I would be contributing 
This would for sure be great to have, but implementing it could be a pain and would probably require the creation of another setup similar to how ajenti-v is, but having like ajenti-manage or something.  Question comes down to security and managing separate instances that may be on older versions of OS/kernel, and handling errors, etc.

BUT it would be amazing to have, right now we just use puppet to manage them, but having something ajenti branded would be sweet!
+1 for me as well, we use CSF on 99.9% of our servers and IMO it's become the most stable and reliable for cPanel and even non-cpanel servers.

It may be well worth reaching out to ConfigServer about integration as I know they have it for Webmin, and the other plugins they have work really nice as well (configserver exploit scanner, mail manage, etc)
You need to install the package, if using ubuntu or debian:

apt-get install ajenti-v-ftp-vsftpd

CentOS or RHEL

yum install ajenti-v-ftp-vsftpd