It should be possible to specify through config which subfields in the location widget are visible. Possible fields:

• latitude
• longitude
• altitude (currently unavailable, but may be useful to some)
• heading (currently always enabled, not that useful for many, should be hideable)

To consider: how should we handle validation of this? Hardcode it, allow external validators?
Maybe we should introduce fully configurable compound fields with aggregated validation? The location field would be a good use case for that, but are there any other potential uses?