Zum Wegwerfen ist es zu schade!
… is a clear case, since "zum" has to be followed by a noun, which then has to be capitalised.
But what about …
Zum vergammeln lassen ist es zu schade!
What's the correct capitalisation and hyphenation (if any) for a nominalised compound word like this?
According to § 37 (2) of the official spelling rules, multi-part nominalizations are generally written as one word (which, being a noun, is then capitalized as usual):
Zum Vergammelnlassen ist es zu schade.
In more complex compounds, hyphens are used to separate the parts (§ 43):
Zum In-den-Mülleimer-Werfen ist es zu schade.
In these cases, the first word, the infinitive itself, and any noun parts are to be capitalized, as regulated in § 57 (2).
