multiple DC api questions

[jeff blasius]

Hello Dmitry,
I have the following questions regarding the api:
1. Is there a way to expand the search radius in the geocoding
(getFromLatLong and search)?
2. Our system stores both the token and srid to poll for updates.
Can you recommend polling rates for updates to this data? For example,
we're polling to translate the token to srid hourly and to check the
status of the service request daily. Generally speaking, is this the
recommended way to do this or do you plan on offering callback
functionality?
3. Do you plan on providing error codes for any of the calls? eg. if
the service is busy? Can you provide a list of these?
4. At what point does data validation occur? When submitting to get
a token or when exchanging a token for a srid? Right now it just seems
to accept anything.

Thanks!
-jeff