Not exactly, but the gear menu at the bottom of the window will usually have the correct item highlighted by default when you open it, which saves at least some time. You can open that menu using the keyboard with ⌃⎋
Yes.
Technically, there isn't a “current bundle”, just a current language. There could be relevant/useful things for the current language in a dozen bundles
technically true, but it's obvious enough what I mean.
basically like opt-esc but with just the current bundle's commands/snippets/etc
⌥⎋ is for completion, which is already very bundle/language specific, so I'm not sure what you mean
I misspoke, I rather obviously meant CTRL-esc.