I did see a sniipit on a video about a dragon warrior type scrolling and for that purpose,like a tease from joe for a future version, maybe even 4.5 .
I would say scrolling 4 ways would be a hurdle here, but if you do it different instead of the same, just make it go screen by screen and not scroll.
The adventure module seems like a good way to go. For the battles. Possibly make special screens that you are taken too, say battle room grasslands(if you encounter a battle in grasslands) and so on.
Stats are just variables but lvling them correctly would take a little math and stuff, just multiply if exp max reached and raise 1 level.
So for leveling ,create maybe a current exp, expmax
. When current exp reaches max exp, do all stat additions or multipies and add 1 level.Fill life magic, make expmax higher.
Just some ideas.