The new Ghost Experience update will allow us to sell and dismantle multiple items at once. And I'm sure Ubisoft are going to fix the random base explosions, as they are aware of it.
As for crafting gear over 250 gear score, there has been no word about this at all. I assume this is because the majority of Breakpoint players wanted to see gear score removed, so increasing the gear score on crafted items became a moot point.