There are two questions embedded here: can we use myths to peer into a pre-literate past to determine what happened long ago and does the study of myths have any use for historians?

The answer to the first question is general no. Some legendary material may echo events from long ago. When we think we can connect details of a story to pre-literate events (rising sea levels, a meteor strike, or as you say, "conflict in the actual founding of Rome") that act of connecting dots can be thrilling. Once they are connected (or more likely imagined to be connected) there is little else to be gained. The simple use of source criticism is likely to leave us discarding any specific details in the stories so that the stories are left shedding next to no light on ancient events. The connections are nice to imagine, but the entertaining process of imagining a connection is made cannot be used to understand the previous event in any substantive way.

The answer to the second question is a definite yes: the study of myths does indeed have use for historians. As others have answered here, myths are the stories of the people who told them. They can provide windows into the culture, the mentality, the society, and the values of the people who were telling them.