I assume you simply mean adult content. I'm not against adding any, or even adding in a touch portion, it's just that I am most definitely not skilled enough to draw any of it. The DLC might have the images needed to possibly do some edits, but we'll have to wait and see.
Outside of using a SSD, disabling/not using steam, and/or running as an administrator, I have yet to hear of any other solutions so far, besides that the test trial seems to (somehow) improve the loading. I'd be happy to hear any other tips you find.
You most likely downloaded the 'New Files Only' pack, which was made for people who had downloaded the main pack from earlier versions to help them sort through new files to translate. Try download the main 1.5.7 languageset 'full' zip. I renamed the main zip to make it more easily identifiable. (Make sure to use the 'Chinese translations' folder for Chinese Translations!)
I did see that bug part of the test version, it did eventually switch, but way too long of a freeze frame for anyone to wait for. So, repacking isn't perfect (especially not with repacking time). The BasicData is based off the jp version (as this was a test), but yes, you can replace the basicdata.wolf from the test with the folder and it'll work. In reality, you most likely only need the english/japanese folders packed to try to reduce lag. You'll need to use WolfRPG to repack the game by going to 'File'->'Create Game Data'.