Great to hear! As far as I was able to I haven't found more possible buttons using the "VDR-Live" Plugin. Normally the not usable buttons are not visible in the VDR mode of DreamRemote. It should look very similar to this at your N900:
Hmm... no, sorry. I wouldn't do that. We had already discussed that with the AZBox controls. I'm currently unable to check in what state your VDR is. And there is no gurantee that a normaly useful macro could make something strange if you press the button while you are in the movie menu at example. So I'm sure you would agree with me that this could get sometimes very confusing or even dangerous for your movie archive.
Yes, I know that problem. It depends on the load of your N900 and something strange with the network communication.
But if you know the menus of your VDR well you can type as fast as you want. The commands will be cached and executed by your VDR as soon as everything is ready.