I have a feature-request and I hope this is the right place for it. At http://de.wikipedia.org/wiki/Hilfe_Diskussion:TeX#Kommutative-Diagramme_.2F_XY-Packet I have started a discussion and some people agreed with the suggestion.
I suggested, that in the preamble of LaTex of Wikipedia the packet XY should be loaded. Informations about this Latex-packet and how to load it could be found at http://www.guntherkrauss.de/computer/tex/diagramme.html . With this packet it is possible to write commutative diagrams directly in Wikipedia. So the author doesn't have to create a picture by its own. This would save some time for the editor and it is much easier to adjust the diagram by another people.
I hope you will understand my poor English and I hope you will include this feature.