Thanks. I haven't explored other file explorers in a while, and I figured that some of the features I listed exist elsewhere. But I was typing from my phone and was thus too lazy to type a qualifier.

"Just use your window manager" - and have two separate Dolphin windows? I mean, yeah. But it's very nice to have everything contained in one window. Right now I have five Dolphin tabs, four of which have split windows (I don't NEED this setup, but I like it).