@Hejti New features like that aren't going to be added to the current site. Any "new" feature you see will be a part of v5, not v3. No, there's no ETA on v5 either.
As for getting spoiled by covers, it'd be about the same experience as walking into a bookstore and trying to find something to read. Japanese bookstores aren't actively trying to hide images from people because it might spoil the series for the newer readers. It's not that big of an issue seeing covers of future volumes imo
> seing cover of the last volume is a big spoiler, it usually can show u what girl won and so
Mind to name let's say 10 titles where it's an issue? I just checked my follows but I can't find single series where last volume cover is indeed "big spoiler" :/
Excluding some series where "winner" was obvious from very first chapters.