Mechant calculation timeout from Google

Hello,

is it possible to increase timeout for response?
Because there several popular shopping carts, which use
on-line
services (for example) for shipping calculations during
Merchant
Calculation callback.

And very often we get error from Google: "Your server
should response
faster...".

Sorry, but for our server really could not response faster,
even it is
placed on very fast pipe.
Good ideas could be:
1. increase timeout
2. let us manage timeout ourserves in control panel

Other request ;)
Please make field for Merchant Calculation Callback Url
wider (even
style="width: 100%")