On the Master Features Board page in Aha, there is a filter called "Master Feature Search" that I use to find a particular master feature very quickly. The Master Features show the Rally integration number (e.g. EP1234) but you cannot search on them. I would love to be able to type the Rally ID in the Master Feature Search field and have the master feature associated with that ID in Rally to be shown.
Right now if the development team just gives me a number, I have to look it up in Rally to find the name and then search on the name in Aha.
Thank you for your idea. This is currently possible using the global search in the top right corner of the menu. Enter the Rally ID and click Search all content. This should show the linked feature in your search results.