"make mrproper" will clean out your .config from memory - if not deleting .config should do it. Then go into menuconfig, device drivers, USB and put in a value for "USB HID Polling Interval" - 10's the default, 2's nicer if your mouse will handle it.
Or it may well be easier to edit .config, and find the USB_HID_MOUSE_POLLING_INTERVAL line, and change it to "CONFIG_USB_HID_MOUSE_POLLING_INTERVAL=2".
Lunchy: Note that it's the polling interval, not the polling rate. Hence a value of 2 gives 500Hz polling - when you entered 1000 it would have been checking once a second. Your mouse probably got totally bored/confused and stopped bothering at that point








