There is a long-standing wish among developers (http://trac.openstreetmap.org/ticket/149) for users to be able to set preferences, so that (for example) you could have your own favourite tag presets no matter which editor or computer you were using.
What needs doing
- Decide how prefs are to be encoded in the 'text' column (serialised Ruby hash? or =/; separated like node/segment tags?)
- API to set/retrieve prefs