FeatReq: .build allupdates -> Build updates only?

(Unless it already exists, or these is a reason not to) I'd like like to see an option to build just everything that needs to be updated, and not everything.
Currently when I few items need updating, I manually enter those commands with .build xxxxx, until everything is updated again.

I know that ".build all" will build 'everything', but since that usually takes quite some time, I would like to see an option that just builds the items with updates (and related items ofcourse if needed).

Nevermind:
... does this already.

Didn't see it the list, but just noticed it mentioned at the bottom after doing "./build versions"