Not a single component I tried allowed comments to appear expanded on the front page by default - including this one.
I posted this on the FLEXIcontent forum and within a few hours the dev came back to me with a detailed and VERY SIMPLE hack to achieve my goal. I tried it, and hey presto, perfect!
I cannot believe how clearly this is coded, and how attentive the developer is to his customers. Wow!
If I could give 6 stars, I would. Highly recommended. And thank you so much to the dev, who continues to excel himself every time! Simply brilliant.