In some of our surveys, we send out invitiations via snail mail. Each mailer has a token on it. While I can create my own list of tokens, and import them into LS, this is an extra step I'd like to avoid...

I'm wondering if there is a way to prevent LS from generating TOKENs that contain both the digit zero and the uppercase letter O? This is because sometimes we get tokens like ABo0O2OA  -- and in print, the zero and the letter O look very similar, resutling in typoes. 

For my case, if someone can provide code to modify LS to avoid O and zero, I can update my local instance to accomodate this. 

I'm using version 3.25.6+201229   

No, this is not available in the core package.

We did some work on this, but at the moment I do not know if the plugin will work out of the box:

github.com/toolsforresearch/TFRcustomToken

Please create an issue if this needs follow-up,

Tammo

In LS4 there is a core plugin that allows this:
github.com/LimeSurvey/LimeSurvey/tree/ma.../plugins/customToken

In LS4 there is a core plugin that allows this:

But please note that LS4 is not yet declared stable so for production I would still wait to use it, for testing: Go for it!

Would it be a huge amount of effort to make the plugin 3.x compatible? Alas, I'm not a PHP developer, but might be able to sponsor the work...

Did you try the plugin at github.com/toolsforresearch/TFRcustomToken ?