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Thanks for the feedback!
The current version of Candelair is signed with a Developer ID that lacks a special flag that Yosemite now requires for kernel extensions to load. I've already applied for and recently received a new Developer ID from Apple with this flag set, so this issue will be addressed shortly.
Please see "OS X Yosemite" in this blog post for a workaround:
http://www.iospirit.com/blog/article/185/Remote-Buddy-1-25-adds-support-for-Harmony-Smart-Control-providing-control-over-100-Mac-apps-and-what-else-is-new/
Your second problem - that the PS3 remote won't work - is linked to the first: Bluetooth support in Remote Buddy is currently only available when the Candelair kernel extension is installed and loaded. Using the workaround from the blog post above should bring back Candelair - and thus Bluetooth support.
I'm already testing a new version of Candelair that's signed with the new Developer ID and so far it works great. Since I have to maintain backwards compatibility, it'll take some more tests before I can release that version, though.
Best regards,
Felix Schwarz