Gliding has to be enabled on per-ship basis, so there's no mod out there that fits all possible mods. Unfortunately I do not know if there are any mods out there that work properly on current FSO builds and has at least all FS2 ships included. I based one of my old gliding mods on Sushi's work if I remember correctly, so he may have one. Building one from scratch for FS2 shouldn't take longer than 20 minutes though, it's just boring copy&paste after the first entry. See the wiki link lostllama posted for details how to make one yourself.
As for the AI, it was indeed included with BP 3.6.12 feature pack but that's as outdated as you get. The latest release topic is located
here but it doesn't do you much good because all my mediafire download links have been dead quite a while now. People who downloaded it may still have a copy laying around in their HDDs, but I don't have any surviving copies of it. If someone still has it, there's at least one bug that needs to be fixed. An ai_profiles.tbl flag is named incorrectly and as such doesn't work (Spoon knows which one). Of course, there has been a bunch of flags introduced in newer 3.6.13 builds that aren't in it, so someone may want to update it beyond fixing that one bug if they feel like doing so.