The only reason to widen/remove outlane posts is if you're good enough to be practicing for tourneys. If you're that kind of player though, all your machines will be like that and you will still be able to crank off good scores regularly.
The reason those posts are adjustable is to match the skill of the players. The audits tell the operator how many balls exit through which lane, among countless other stats, so he can make adjustments so that the player base can achieve high scores/free games on occasion to keep them coming back for more.
You could also try a plastic post instead of a mini post if it's really monstrous.
Also re-set the high scores every month or so, so your family can compete for the HS table.