I think the first expansion definitely covers some of your points here!
Voice chat has always worked better if you get right up on the mic. I tried a few methods to boost the volume/sensitivity, but it ended up blowing out the audio and making feedback.
As far as crank use goes, when I do end up using it it'll likely be for non-combat stuff. I guess it's a very personal preference, but I'm not a fan of games that require crank use along with dpad or a/b. I know PQ isn't exactly twitch gaming, but you do sometimes need to reposition/use targeting quite rapidly in some situations and throwing in some use of crank there just feels like it'd be uncomfortable to me.
How do we all feel about fishing?!
As far as secrets and puzzles go - i would LOVE to do more of that kind of stuff as well.