Multiple keywords for key

[torbei]

Would be great if there is a way to define multiple keywords for a key instead of creating multiple keys with the same value.

[domschrei]

You now have the option to write something like this into your custom definitions:

ampersand,fancyand,curlyand=&

which will be internally expanded to:

ampersand=&
fancyand=&
curlyand=&

The amount of keywords on the left side (>= 2) is arbitrary. Note that this feature disables the use of commata inside symbol definition keywords apart from multi-definitions.