1. It is unlikely to get regularized if DD coaches make it to MAO during proposed next week Trial runs.
2. The time slots are fixed. Dep Mumbai in the morning and Goa in late afternoons due to demand pattern.... Also primary maintenance of the rake/DD rake will be at Mumbai and hence it needs to arrive Mumbai by ni8.
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3. Yes, Shatabdi or DD being fully AC can be easily made to run at MPS depending upon track conditions. Rajdhani already runs at MPS throughout in this single unelectrified section with top priority. Even if DD is made to run at par with Rajdhani, the necessity of halts might make it run at par with JNS/Rajdhani n not faster.