Re: 4-way switch for use with humbuckers?
Please clarify exactly what you mean by slide switch. To me, the term suggests Fender Jaguars, the Brian May Red Special or a non-reverse Gibson Firebird.
If you require a Fender-esque switch, the four-way, ten contact type will not do what you ask.
There are five-way types with either twelve or twenty four contacts that will do what you ask AND have one selection free to offer one more sound.
If your guitar has the Switchcraft toggle selector switch associated with Gibson guitars, there is the Freeway 3x3-03.