My wife is basically trying to do something similar. She wants the 'best friend' and 'father of her children' relationship with me but then the freedom to see OM at her own pace.
Classic having your cake and eating it too as far as I am concerned. I thought this was a good idea for a while too until I understood that this is a complete lack of respect for me and our marriage.
I promised to keep the peace until Christmas at which time her rental house becomes available. I have made it crystal clear to her that the 'best friend' routine ends the day she leaves our home. There will be no more 10 calls or 50 texts per day etc. There will be no unscheduled visitations for the children. My week is my week, hers is hers. Seperation MEANS seperation. There has been a lot of tears on her part since this conversation. I am not entirely convinced at this point if she will go through with moving out or not. She is welcome to stay as long as she wants on the proviso that we see a marriage councilor. Other than that, she will have to go through with her plan to leave. Everything has been on her terms after BD day. That changes now. No woman wants a doormat for a husband. In fact, it seems the more I am hardening to her emotion and the more I pull away, the more she wants to discuss R. I just need to have the mental fortitude to keep up with my actions and not let the emotion get in the way.