No, there is currently no method of requiring a PIN to access an installed channel. The only thing controlled at this time with a PIN is to add or remove a channel.
Many channels ask who's watching when the channel loads, which are usually considered profiles, and Kids is often one option. However, I haven't seen any of them provide a method of controlling access to the user profile. For that functionality, it would have to be added within the channel itself, not something under the control of Roku.
I can't say if the Roku OS is capable of supporting PIN access on an installed channel. With the programming knowledge I have (not a huge amount, but some), I would think it could be done. However, the Roku OS is a highly modified version of Linux, and one way to keep it small enough to fit in the Roku memory probably requires removing a lot of unused functionality. Since many Roku devices only have a small amount of operational memory, Roku can't easily add those removed functions back.
Dan
Roku Community Streaming Expert
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