To use replace edits, you still have to reveal the clip in the event browser first (Shift-F). Then you can use the Shift-R and Option-R shortcuts.
To make clips on the primary storyline stay put, you use the position tool. Almost any edits you make on the primary storyline using the default pointer will cause ripples. When you don’t want that to happen, use the position tool.
If it’s a connected clip you don’t want to move, use the tilde key. You can even lock this key in 10.0.8 by holding Tilde, then Shift, then release Tilde, then release Shift. This locks the override connections command until you hit Tilde again.
Hope this helps.