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I modified one of the standard keyboard layouts in /usr/share/X11/xkb/symbols/ but every time the package is updated my custom layout is overwritten and have to copy it again.
Is there a "permanent" way of overriding the standard keyboard layout with my custom one?
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a) use another filename (inherit the one you use and only alter the specific aspects)
b) use pacman.conf NoExtract
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Like seth says, use another name, e.g. /usr/share/X11/xkb/symbols/custom. You can layer it on top of another layout with an include directive, e.g. include "level3(caps_switch)".
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