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Just click on a tag to remove it. Alternatively you can also press the backspace-key when inside the input field.
Context can be managed with the tags. I use them quit frequently for my context. At the beginning i had a extra context entry, but i often needed more then one context. So i removed the context entry and used the tagging instead.

For my actions i didn't have the need to configure the energy or effort, as it is obvious when reading my todolist. You could also use the tag mechanism to add the required effort/energy to each action.

If this is not sufficient to you, how could i improve Wieldy in this point? If i would add an effort input field, what would be the options i could choose from?
In the default configuration it will only check for stable versions, but you can configure this in the settings.

Alternatively you can always download the betas from the website.
The file synchronizer is using either a XML File (the schema is set by Wieldy) or it uses the same XML File format in a encrypted and compressed way (when encryption is enabled).

When your CSV file is opened by the synchronizer, it detects that it is not a valid XML file and thus thinks the file is encrypted.

Unfortunately, the short answer to your question is, that Wieldy right now does not support the import of custom csv files. Maybe you can import the csv File into Outlook and then import it from Outlook to Wieldy.

I will think about a solution, but right now my guess is, that i don't find a quick solution.
I will check what is quickly possible, everything else may take some time.