Speech Custom Keyword Training Data

I am looking at the Custom Keyword feature in Speech Studio. On several places it is hinted that you can add external training data

• On https://speech.microsoft.com/customkeyword it states the model is always improving as more data is added
• On https://video2.skills-academy.com/en-us/azure/cognitive-services/speech-service/custom-keyword-basics step 7 there is a toggle that show you can add training data

When I go through the training myself, I only have the option for:

• Basic
• Advanced

Both types do not allow you to add extra training data

So my questions are:

1. Is it still possible to add you own training data to keyword models?
2. If the answer to 1 is no, can the recognition rate of the models still improve outside of a general update from Microsoft?
3. I have trained a basic and advanced model. Is it possible to adjust the sensitivity of these models?