Basically I've run several times now into the problem that I need to insert a row of edges in a mesh but there's simply no tool to do so. This is only a problem when working with tris, as when working with quads the loop cut tool does the job.

Example 1: Take a look at the picture http://www.mhermann.net/upload/insert_edges_01.jpg
There's currently no easy way to get from the left mesh to the right one. You would have to
1. select the red edges
2. mark as sharp
3. tab out of edit mode
4. apply an edge split modifier that splits the sharp edges
5. tab back into edit mode
6. deselect all, and select only one set of the newly created edges
7. move them along the x axis
8. deselect all, select a pair of two edges and create a face (selecting all edges and using a face fill doesn't work in this case)
9. repeat step 8 for the rest of the edges.

Example 2: http://www.mhermann.net/upload/insert_edges_02.jpg
Again we want to insert a row of edges so that we can "solidify" the icosphere at the top. Obviously the solidify modifier doesn't work here because there's a monkey attached to the outside of the mesh :).
The way to do this is similar to the method above: split the mesh at the red edges, select one set of edges, scale a bit smaller, create new faces.

So there's a way around the missing tool but it's kind of time consuming considering this could be done within a second if the right tool was implemented.

On a side note: If an "insert edge" tool was available you could also use it as an alternative for the loop cut tool when working with quads. It is also probably more intuitive for people who are new to blender to insert than to cut.

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