That's great news. I love the Lethal Weapon movies and Kiss Kiss Bang Bang was great!
Last Action Hero is an incredibly fun and creative movie.
A lot of the movie's silliness inside the "movie world" is meant to be a parody of your typical "Arnold action movie", which it feels like people just ignore. One time I saw someone complaining about how unrealistic (relatively speaking) some of fictional Arnold's action stunts were. Well yeah, that's the point, everything is over-the-top in the fictional Arnold.
Yeah, I love that movie too for reasons you point out.