More a feature request than complaint: I'd like to be able to add/remove icons to/from the set of available icons.
I agree. And I am sure that a library of icons would immediately appear as donations from around the world.
Stefano F. Rausch
Partially you can already do that with the user-icons.
It might be that the devs will evaluate the feature to remove the standard "hard-coded" ones in future. However, one must be aware of the fact that the portability of maps will be reduced, for the question how to deploy "individual" maps with an own icon-set has not been further discussed, AFAIK.