If you're using favorites you might need to update them.
If not:
The things you set in a tool will stay until the next time. So just set it once, but don't place anything. This can be done everywhere, e.g. set a default layer for walls.
If you're happy with your "defaults" just save the file as a template: it will remember the tool settings as well!
For all the objects already placed:
Just use find&select.
