Somewhere was a file which told how much renown you get from doing different things...
*Checks*
*Finds something offtopic*
In some file was time compression settings, there was maximum setting, that 8120 or something, can you rise it to ridiculous amounts or does the game crash..?
Well, it may be that I didn't remember correctly, every aircraft file has the amount of renown you get from shooting one down...
I have got pretty good renown amounts by just going to the biggest party in the sea and sinking enough ships but if I remember correctly leaving object not completed gives you 500 renown penalty.. Sounds quite big..

Perhaps I'm wrong...
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Elektroniikka-Asentaja = Electronics Assembler. In finnish, Just in case someone wants to know..
New rig for noisy running:
Desktop w/ Asus P5QC motherboard, Intel Core 2 Duo 2,94 GHz processor, ATI Radeon HD 4800 series graphics, 4 GB DDR3 Ram and 1297 GB hard drive memory
There is a good possibility that the above post was written with a phone so please forgive the typos