It isn't something that I would be willing to include as a standard configuration option, because it goes against the one of the prime objectives of the module, which is to supply *accurate* quotes (within its capability to do so).
Also, if this was going to be considered, what method/means would we have of ensuring you don't end up screwing yourself by making the maximum cap a lot lower than actual costs?
The secondary objective of the ozpost module is to protect the merchant from under quoting, which is almost always going to be more detrimental to the long term survivability of a store than over quoting. Plus you get additional 'brownie points' if you do over quote and then provide a refund :)
For many stores, a few $$$ difference in shipping costs isn't going to make much difference in the grand scheme of things, but for many other stores this can make the difference between a profit/loss on the entire sale.
Anyway, if you DID want to add your own maximum cap, you'll need to edit the ozpost.php file, locate the line of code that checks to see if ($quote->cost > 0) { , then just after that line insert another line that'll read something like
if($quote->cost > YOURMAX) $quote->cost = YOURMAX ;
I can't tell you the exact line of code to change because it will vary between versions.
Cheers
Rod
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