It should work OK so no need to be wary. As long as you have no issues with running a php script with cron as I had.

I am in the final stages of making a variant of this that doesn't rely on traditional cron jobs to update the currencies and also adds yahoo finance in a way that doesn't rely on page scraping. (page scraping as currently used by the currency update functions in zencart is vulnerable to changes in page layout).

I am just waiting to see what actions the site admins take on existing contributions following a rather bizarre email full of what I think are unnecessary prescriptions on dos and donts they recently circulated to people that have contributed in the past.

The email contained a ultimatum to comply within 30 days with unspecified consequences.

If they start applying heavy handed censorship as the email suggested might be the case, then I guess I will have to review the point of uploading contributions.

One important point of open source is freedom to code as desired not marching to some totalitarian tune.

So, in summary, you should be able to use the existing contribution or keep a lookout for an improved version which will come depending on the way the site admins decide to go.