In the 4.1 release, due out later this year, there will be individual configuration options for the showing the LinkedIn, Google+, and Twitter buttons in blog or article views. We're looking into separated settings for featured articles, but not sure if that will be in the 4.1 release.
For the "Num Comments" features, that's something that is possible using Facebook, but not something we do in JFBConnect currently. We're planning quite a few updates for the comments feature in JFBConnect 4.2, due early next year, and what you're looking for is one of them. It's still in the planning stages, and not something that can be done with a few lines of code though, so can't really just say "Do this", unfortunately.
Finally, for the Comments width in featured views, the following code change will hopefully help. In the /plugins/content/jfbccontent.php file, around line 300, you'll see:
function _getComments($article, $width, $numposts, $colorscheme, $renderKeyString, $isJoomla)
{
$href = $this->getCurrentURL($article, $isJoomla);At the top of this function, modify it so it looks like:
function _getComments($article, $width, $numposts, $colorscheme, $renderKeyString, $isJoomla)
{
if ($view == 'frontpage' || $view == 'featured')
$width = "200";
$href = $this->getCurrentURL($article, $isJoomla);
Obviously, change the 200 to whatever width you want. Hope that helps!
Alex