As user6726 said, a contract to sign away statutory tenant rights is virtually never going to be enforceable. Tenancy is a situation that basically always involves contracts; the whole point of statutory rights is to limit the scope of these contracts. Waiving tenancy rights would be sort of like waiving minimum wage.
"Consideration" doesn't change anything, because it's assumed when you're talking about contracts. A contract without consideration is void. However, while your example of consideration isn't really what "consideration" means, it is a possible exception to tenancy rights. Certain situations are generally excluded from statutory tenancy rights; for instance, being in the hospital for two months doesn't make you a tenant. RCW 59.18.050 (to go with user6726's Washington theme) also excludes
Occupancy by an employee of a landlord whose right to occupy is conditioned upon employment in or about the premises.
In other words: You can provide your employee with housing that they only keep as long as they work for you, and in that case they're not a tenant. A live-in housekeeper is a perfect example of this.