Those are certainly some interesting things you mention. Multiple image columns might be an interesting idea and potentially something for a different viewing mode. I’ll definitely take a note about that.
For keybinds I thought about making them configurable, as they already map to specific actions anyways. For now they’re:
Q: Previous image in album or if beginning previous post E: Next image in album or if end next post A: Previous post E: Next Post S: Save Post
I‘m still considering if I want to add mod tools as well but for now I’ll focus on normal users.
I‘m currently working on exactly what you said and will probably release an initial version this weekend. It’s barebones but working quite good already. I’ll announce it in the Lemmy community once released.