The reason I combined a few things in this poll is because I personally don't want them to implement D&D 5e mechanics and monster stats using the current monster encounters and limiting us to a party of 4. All this kind of goes hand-in-hand.
Here's what I personally want: The ability to create a party of 4 Custom Characters or play with 4 actual players, we all create our own and adventure together. Then, while we're adventuring, we can add Lae'zel to our party when we meet her. Then we can face 3 actual imps with proper imp stats in the very first combat scenario. 4 PC's plus Lae'zel, a party of 5, can defeat 3 imps with a moderate challenge. Likewise, this same party can defeat 2 imps and a hellsboar two times during the final battle on the nautiloid, and they can defeat 3 intellect devourers on the beach.
What I don't want is a limit to only a party of 4 with proper D&D stats and the encounters unaltered so I'm fighting 3 legit imps in the first encounter with only 1 PC and Lae'zel. That's practically suicide and will require a HUGE amount of reloading. Likewise, I don't want to have just me and Shadowheart against 3 legit intellect devourers.
