I’m going to look for a WordPress plug-in, which can suggest links while I type and make the URL link upon my selection. Maybe it can use google to do the search job, and pop up a layter for me to choose. It’s pretty annoying everytime I need to add a link to my blog text. The whole user experience is counterproductive. It just make me stop thinking.
From the point of SEO, outgoing link is so-called PR leakage, which is not recommended. But what’s the point if you don’t add necessary links at all, which might help readers get to the source quickly. SEO can not be paid at the price of reader unfriendly information.