Re: Slave light switches?
I think it depends on how the new switch is designed. If it's one that actually physically flips the existing switch you should be fine so long as you never touch the non-upgraded switch - effectively eliminating the functionality of the 3-way switch.
Originally Posted by nbomar1
I'd look into the documentation of the switches you're considering and see if they have guidance about 3-way switches. It's a pretty common feature, so I'm sure they've thought about it even if only to acknowledge it's incompatible with a 3-way switch.