Ok, just tested that first set of fixes from philmoz, and the one D fix from waterwingz, and I see there are newer versions to try. In the meantime, here are my notes:
100f-1.0.0_TEST (philmoz) works! Lag is fixed. Usb remote down-up does autofocus and then enters wait mode, another down-up releases the shutter with no lag.
100d-1.0.0_TEST (philmoz) camera goes black when pushing the onboard shutter button, seems to turn off with the lens out. Cycling power brings it back. This patch does fix the recording partition apparently (at least under the format menu it shows 3.7GB instead of 15MB). Using usb remote, down-up does the normal autofocus and enters wait mode, then down-up puts the camera into blank limbo. Waited two mintues and cycled power.
100e-1.0.0-full_TEST (philmoz) On startup, I see a CHDK logo and the Firmware info. and then camera seems to lock up. Pressing Menu does nothing but beep, pressing Play/Alt a couple of times seems to turn the camera off. Weird, then trying again, cycling power, the camera started up and showed Alt at the bottom. Then it seemed to hang. If I Power up, press half shutter, Alt, I get the CHDK menu. I scroll to Miscellaneous and hit right arrow, and the camera shuts off.
100d-1.0.0 (waterwingz) Goes back to the 15MB partition, and usb remote works like normal (down-up does autofocus and enters wait mode, another down-up releases the shutter with no lag). So I think this seems to work as it did before.