Stop trolling and help.
Yes, I do refuse installing Windows on my main computer, as I do not have a free partition around on it. Actually, the hard drive is quite full.
Also, I do not have a sound card in my PC, just some onboard chip.
Oh... and I don't have a surrund sound system either. So even if I wiped all my precious data to install Windows and bought a sound card that supports surround, I would still not be able to test surround sound.
What are you expecting? This game is free. You can't expect the developers to buy extra hardware and operating system licenses so you can download the game for free. It works different - if you can help with something, do it.
And actually, I did already invest money into developing this game - I bought some ATI card for testing. Too bad it doesn't fit in my new PC, and I don't have the old one any more.
As for the OP's problem: did you try a more current version of the SDL?
http://www.libsdl.org/release/SDL-1.2.12-win32.zip contains a DLL, overwrite your SDL.dll with that and post if it helps with your mouse problem.
1. Open Notepad
2. Paste: ÿþMSMSMS
3. Save
4. Open the file in Notepad again
You can vary the number of "MS", so you can clearly see it's MS which is causing it.