Things to do

Lyx needs GUI support for document macros.

I say this because I've seen several times now the need for a user defined paragraph style, such as "Example" or "Exercise" or "Answer". This could potentially be solved by having a style editor? This might turn out to be a considerable amount of work.

Also, however, it needs simple replacement macros. An example I use a lot is \termdef{index item} which makes the index item text bold and adds an index entry. This kind of speed is not available to Lyx users. I suppose this is more of a variation on the noun/emphasis theme - user defined versions of these with custom Tex macros would be sufficient for this usage.