[Plugin: Tumblrize] Excerpt instead of Full Post?

I don’t want the entire article posted to Posterous or Tumblr but just an excerpt (say the first 150 words), plus the 1st photo, and a link back to read the rest. Can that be done?

Thanks so much for your help – it works perfectly with this one small wish granted it’ll be outstanding!

https://www.ads-software.com/extend/plugins/tumblrize/