Ola,
Your feature request is easy enough to implement, but it's already supported via the regexp flag:
<switch flag=regexp @switch_var@>
<case value="foo|bar|baz">
You selected foo bar or baz
</case>
.
.
.
</switch>
Of course regexps are kind of obscure to non-programmers, so your feature might be useful to make it more accessible to graphics designers...
