So -- make the macro and assign it to a key. You could also add a line to the macro and have it execute your action for digging. The problem is that if you are digging with Knowledge turned on the targeting text changes. If you want to change your macro you can. If there is a default key, you have to make a macro and override it anyway.
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Remembering Tyneetryk
Phaedreas Tears - 15 years old and first(*) of true neutral guilds in Atys.
(*) This statement is contested, but we are certainly the longest lasting.
<clowns | me & you | jokers>