If you have no knowledge about l2off, you are / will be screwed, since each move you would like to make you will be like "how to do that". So, if you want to go with l2off, find someone experienced / familiar with off files, so he can be your 'dev'.
I laugh on this one, seriously :D I'm not 'protecting' aCis or something like, obviously. Zaken - customer section. Frintezza - customer section, even if the code is a lil bit crappy, you have it working as it should. Else, you could buy better, more retail like version for like.. 5 euros, top 10?
You mean Spawn Manager. Not an issue, at all. Pirama explained above. It's about cata/necro mobs, which use like 2 or 3 spawnlist, regarding currect 7signs state. So, mobs which are supposed to drop seal stones, are missing / not spawned. Mobs with 'empty' droplist are spawned atm. You can use old spawnlist to "fix" it.