Update or merge the various style transformers (PDF, Mapinfo, CAd etc) into a style manager super transformer. Allow for importing styles from other datasets and tables as well as from json and SLD (whole map styling) and SVG + PNG (individual feature styling) files.
Various agencies such as the OS use sld style files. OS Mastermap for instance would be a lot less painful in organizing styling if it were possible to open the style file up and convert data in the fme-colour and other style fields. If this information auto transferred to other writing formats then even better.
If you could also preview styles within the style manager such as point markers and transparency as well as open up new style markers in SVG or PNG format then FME would start to look as powerful as GIS in terms of map creation. It would be amazing if the style manager could connect to the Mapnik rasterizer as well.