We might re-think our practice of routinely splitting routes at ferry crossings, no matter how short. One thought that occurred to me while we were discussing IL 108, which includes a similar short ferry link: Even if we develop a separate branch of the project to cover ferry routes, its developer(s) might give low priority for ferry crossings as short as WI 113's and IL 108's. The priority might go instead to long ferry routes like much of the Alaska Marine Highway, British Columbia, and Newfoundland ferry systems, and especially interstate, inter-provincial, and international routes (like some in Europe) that connect different highway routes rather than just fill highway route gaps.
Especially if new ferry route systems become "select" systems, not intended to cover all ferry routes, it might take awhile if ever to cover WI 113's ferry gap. Something to be said for just treating that gap as part of WI 113, at least at the option of the maintainer.
