The Problem

whenever i want to move blocks with worldguard i have to set block breaking and placing to true, which players can then grief any way you could maybe add a flag for that?

A Solution

add a flag for sticky piston functionality or atleast make the piston flag work properely

Alternatives

No response

Anything Else?

No response

Pistons work as intended. If they are pushing stuff within a region everything works fine by default, since they are members of the region. If you want pistons to push stuff across region borders the piston needs build permission in both region, which is what you can accomplish giving both of those regions a matching nonplayer-protection-domain with the nonplayer-protection-domains flag. The piston flag also works fine, it does not override build permissions, which is how every other flag works as well.
See also the Common Scenarios in our docs