SectionEX Character Limit for Display

It would be great if it was possible in SectionEX to set a character limit for displaying articles. This way you could show a teaser amount of text but have it short enough to proceed on to the next article. The extension AlphaContent does this, but it only works for Joomla 1.5. Here's a demo of it: http://testing.visualclinic.fr/alphacontent.html

I'm trying to display content something like this: http://www.summitpost.org/featured-trip-reports/p3