If you are into the country look why not try filling only some of the cracks maybe every third one or so and leaving the wider spaces on the board and it will look like that expensive colonial paneling.
Or only do half the wall and use a chair rail to divide the smooth from the regular paneling. Take them down and sand lightly, coat with Kilz then paint your choice of color.
Anyway after you have filled the cracks you then sand a little to get the shine off the paneling and then coat with Kilz or any other good primer. By filling in the cracks and smoothing this way you can even add wallpaper borders to the walls.
Molding is cheap and can be used also to give the room a different feel.
Right now, I am doing some landscape in my backyard with ferns from the woods and other greenery that is perennial.
I just let it dry and sanded if areas were not smooth and I bought a heavy wallpaper (Sherwin Williams) that was discounted and wallpapered my whole living room. I hate dark paneling because I want as much of the sunlight and light as possible. I think I used about 5 to 6 gallons on a 14 x 70 trailer. I used one that was supposed to cover with one coat.
I just bought wallpaper paste and put it up as usual. For the outside, I washed with a pressure washer, which you can rent. I only put one coat on and I wished later I had put on two coats. I otherwise find decorating things at resale stores and yard sales.
However, high gloss, white doors and trim are an excellent choice as they give the appearance of cleanliness or "clean lines".
Never paint your woodwork the same color as the walls. Don't be afraid of color but do be aware of how certain colors make you feel and can, potentially affect how large the room appears.
You then may want to apply a base coat of white paint to ensure that the dark surface doesn't bleed through the paint.