I use f2fs on ssd's and ext4 on hdd's
I don't see the need for snapshots, I backup externally
It's literally the worst distro, https://github.com/arindas/manjarno
Endeavoros is fundamentally better in every way, everything manjaro adds makes arch worse, and everything good they have comes from arch.
For graphical installer - there are already plenty of these for arch that aren't manjaro and don't fuck up your system like manjaro does
As for package manager frontend... pamac is awful, just use octopi or any TUI.
There was no need to make a whole new distro for those two things, and those two things aren't even well polished. They should've just made those tools for arch, and called it a day.
I would recommend using a keyd layout for this