The gold jetpack is from a DLC code included in the retail version of the
Divinity Anthology. There was a Chinese New Year
DLC promo offer early last year for a silver jetpack. The
webpage is still up, so you can try submitting your email address to get in on the deal.
I don't know how auto resolve works in miltiplayer, but there may be a multiplayer mode with just the tactical map gameplay (ie pre-set to auto resolve).
I liked flying in Divinity 2 to get around, so that option in DC would be nice. Unless you can enter a territory not under attack and do something to support the defences, or intimidate / impress a disgruntled population, etc, it might be a little boring. You could let the AI handle combat in one turn to visit an area that needs a moral / productivity / allegiance boost, etc.
Since you have D2:ED, you may be able to get a free upgrade to D2:DC (essentially DKS with an added cheat mode). See
Divinity 2: Developer's Cut and Anthology on Steam.
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