Even with a soaker, you can install either a shower curtain or glass doors. A floor drain could be used if you wanted to make the whole room a wet room, but it needs to also have a trap primer to keep it full, otherwise it will start to smell.
A soaker would need to either come with (preferable) or an add-on tiling flange to keep the shower water out of the walls.
You can use a conventional shower valve or you could use a handheld. With the handheld, you could use a wall-mounted bar to hold it. As opposed to a fixed shower head, the handheld can make cleaning the tub easier, too.