New answers tagged generalisation
There's a couple of plugins which simplifies polygons and may be useful: SimpliPy (allows you to generalise selected features as well as whole layers) PolygonSimplifier (only allows you to generalise whole layers) You can download these from the toolbar: Plugins > Manage and Install Plugins
It might be worth checking out GeOxygene. I believe that has various generalisation algorithms so there may be something for building aggregation or building displacement within that: http://sourceforge.net/projects/oxygene-project/ It is OpenSource but not for QGIS. I did used to have the OpenJump plugin for it installed, but not any longer so I can't check ...
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