I think Manmad-Indore is way more useful than Indore-Dahod. Agar sirf Indore-Akola bhi pura ho jaaye to badi meherbani hogi Indore pe.
Though the planned line is Indore-Mhow-Sendhwa-Dhule-Malegaon-Manmad, railways can only make it till Dhule. Dhule is already connected by BG to chalisgaon on BSL-MMR section