He kind of reminds me of McNabb. McNabb started off as a decent passer but ised his legs and over time became a better passer when his legs got older.
There is no doubt that Lamar is not the passer that many other QBs are. He can rely on his legs now. He will need to improve as a passer as he gets older. If he doesn't then he will probably have 7 or 8 good years imo.
As for making him throw to the Outside: there have been a ton of quarterbacks that have had this issue. It's on Lamar to figure that out. I'm guessing they will practice that a lot until he gets decent at it.