The 1/4000 s limit is the Canon user interface limit (on M10, M3, also M6, etc) and likely the hardware's design limit (why would they build in a more durable shutter).
IIRC reyalp has experienced (temporary?) shutter malfunction on one of his small sensor compacts when he was shooting larger number of pictures with shorter-than-factory exposure times. It would seem that fast shutter speeds put extra strain on the shutter hardware.
Can one use longer exposure times on the M10 than the original firmware provides using the TV override setting (e.g. 5 minutes)?
Should I be worried about using fast shutter speeds on other CHDK cameras (e.g. SX200IS)?
I think we have to differentiate between a global closure and a focal-plane shutter. The global shutter has to be faster and faster with short exposure times, but with the focal-plane shutter only the distance between the curtains becomes smaller or?
OK, I have to admit I don't know the type of shutter used in this camera. In case you have more information on shutter type, or shutter speed vs shutter lifetime, that would be welcome.
If greater speeds don't have adverse effects on the shutter, I might consider adding CAM_EXT_TV_RANGE.
In particular, M3 has a "Hybrid Single Blade Shutter (Electronic first curtain and mechanical second curtain shutter)" while M10 has an "Electronically controlled focal-place shutter".
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Creative Uses of CHDK
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General Help and Assistance on using CHDK stable releases
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General Discussion and Assistance