Play5(gen2) for surround?

I have one Play 5 (gen 2) and a new Playbar -- the former for music, the latter for TV -- both in my living room. No SUB.
(As a quick aside -- since I've seen the question elsewhere -- the Play:5 alone sounds WAY better than the Playbar alone for music).

I wish to buy a second Play 5 to create a stereo pair in my living room (for music). This stereo pair will also be grouped with speakers in other rooms (for example, I have a Play 3 in my kitchen). I figure I'll take advantage of the setup to also create a surround experience with the pair of Play 5s.

A couple simple questions:

1) Can I expect the Play:5's s to deliver a better (or at least equal) surround experience than a pair of Play 1's? For example, will the surround setup be able to take advantage of the Play 5's better base for music and action sequences? Or will the Play 5 satellites just act like "little" speakers.

2) Are there any disadvantages or inconveniences associated with using the Play:5s for both surround (TV) and stereo (music), compared to having separated dedicated surround speakers (Play:1's)? For example, do I need to re-establish the "surround" and "stereo" configurations every time I want to move between the setups (several steps), or is there a simple way to sort of toggle between the two configurations (one being the Playbar with Play5's for surround, the other being the Play 5s stereo-paired)?

3) For music, will it be better to include or exclude the Playbar with/from the stereo-paired Play:5s?

Thanks
Jeff