Langrisser I PCE is really kind of interesting. I finally got around to playing it last month and I think it may be my favorite port of Langrisser I, although it may also be the easiest. I beat the first level without too much difficulty... which may have given Ledin way too much exp for the rest of my playthrough 😛
Another useful site concerning the endings may be found here: https://web.archive.org/web/20081004235223/http://www1.ocn.ne.jp/ixtusui/kanri/laned/ranngued.htm
1) It's in Japanese in case the .jp didn't warn you.
2) It doesn't give the kill or retreat counts, but does provide which ending is with the High/low activity and whether you retreated or not.
3) Sadly it doesn't look like it has all of Langrisser II MD's endings, any of Langrisser I PCE, and is missing C route for Langrisser IV.
4) It does, however, has the Dramatic Edition Endings so that's kind of neat.