My FIL is a waste water treatment officer at our local water authority, he hates disposable flushable LINERS with a passion as he has to fish them out by hand when they clog up the whole system. Same as stupid flushable panty liners they are bringing out now. Its just ridiculous. Yeah they may be flushable but that does not mean they dissapear never to be seen by anyone again. If its not you putting them in the bin its people like my FIL after they have clogged everything up.
I use sposie nappies and no I dont scrape the poo into toilet, the poos are too runny at the moment when they become more solid I might re assess the situation.