To answer your questions:
1) Not with this script unfortunately, which can only show one feed at a time. You can check out gAjax RSS scroller for such an ability instead.
2) Sure, just find this line in the .js file:
Code:
setTimeout(function(){scrollerinstance.animateup()}, 50)
and increase 50 to a larger number, such as 100 or 150
3) You can edit this line within the script, by adding to it the line in red:
Code:
var description='<div class="rssdescription">'+unescape(rsscontent.description)+'</div>'
description=description.substring(0, 100)
100 in this case would mean return the first 100 characters of the description.
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