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PyCURL is the Python language bindings for the cURL library. Blocking it will block all applications written in Python which use PyCURL to access external sites (so, in practice, all applications written in Python). You will definitely make some people unhappy but you will NOT block your own use of cURL, e.g. in the CRON jobs you use to trigger AcyMailing's email sending.

FWIW cURL allows you to change the reported user agent string in the command line. Please read this related article for more information. This means that you can change your CRON jobs to use a different user agent. For example, if you'd pass the parameter

-A "MyWebsiteCRONJobForEmailSending"

you can be quite sure that the user agent filtering will NOT block it: it's very unique and it's not blacklisted ;)

On another note, I do not consider WGet per se to be security issues. What I have observed is that a lot of script kiddies and wannabe hackers use plain vanilla wget to launch simplistic attacks. They don't understand that their simplistic attacks won't work and they are too inexperienced to even realize just how trivial it is to change the user agent string. They are simply annoying and waste server resources. That's how the default user agent string for WGet ended up on that list. WGet is a great tool, being abused by script kiddies.

You're welcome, Patrick! Always a pleasure being able to help :)