Jason,
I have an HLP4663W as well and have been working on URC codes for a few weeks. I have noticed the power ON issue, but my delay time before EFC 001 (DiscreteON) will not work is 30-40 seconds. On a few occasions I have been able to get DiscreteON to function at any time, but it is very intermittent. Every time I reprogram my URC-9960 it may or may not (usually not) work. I have a couple of learned codes, one that works and one that does not, and they very by +4440 -4502 .... and +4440 -4504... in raw data..... Any data you get on the discrete ON would be appreciated and is the only thing I need to complete my setup!
Ronnie