This sounds like a timing problem with your particular EyeTV receiver. I'll need some debug output from you to address this in the next release.

To help me out, please do the following:

1) Make sure Remote Buddy is not running. Then open Terminal.app and enter

killall cfprefsd

defaults write com.iospirit.RemoteBuddy AdHocReceiverDebugLevel -int 70892531

2) Launch Remote Buddy and long press the buttons that have shown a lack of support for the hold state

3) If you open Console.app, you should now see a lot of debug output from Remote Buddy. Please copy and paste it into a reply either here in the forum or to felix [point] schwarz (at) iospirit {d0t} com.

4) Quit Remote Buddy. You can then turn off logging again by entering this into Terminal.app

killall cfprefsd

defaults delete com.iospirit.RemoteBuddy AdHocReceiverDebugLevel

Best regards, 
Felix Schwarz