sh vs bash syntax coloring

I'm not very happy with syntax coloring of sh scripts (starting with
#!/bin/sh). For example, things like
$(command), $((n+1)) or ${var%.txt} are very badly displayed.
However they are part of POSIX sh I think.

Do you know a simple hack to correct this. Something that could interest
me would be always using bash syntax coloring even with
#!/bin/sh
at the beginning.

I thought of modelines but vim seems to use the same syntax file for sh
and bash and thus I cannot use something like
# vi: syntax=bash
or
# vi: ft=bash

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