I feel a bit like I'm talking to myself, since I'm answering my own question, but hopefully, some people will find this useful. I recently discovered that despite the lack of buttons that come with these TV's, they do have discrete input codes. So if you have programmable remote control, you can assign buttons to go directly to any of the input ports without having to scroll through the list. More usefully, they can be used to include input selection in macros on the remote contol.
If you have the newer Pronto remotes, you can just go tohttp://www.remotecentral.com/cgi-bin...hp-tv-2005.zip
and download the file and upload it on to your remote and most of the keys there work. The discrete power on works, but not off key. Others, like HDMI 2 doesn't exist on these TV's, so they don't do anything. The interesting thing is that there are separate buttons for Input 1 composite (AV1), and input 1 component (YPbPr1), and similarly for Input 2. It means you can have both composite and component of INPUT 1 and INPUT 2 connected to devices, and can access either of them via a button on the remote. I don't know if anybody would find having additional composite input useful, but there it is.
If you have some other programmable remote, you can go to:http://www.remotecentral.com/cgi-bin...&dv=television
to get the codes for the individual keys, but, but the procedure will be different for different remotes. I have the URC-8910, so for those of you with JP1 remote, you can start off with the attached file to create the functions (it's in RM format). The file currently sets L1, L2, L3, L4 to COMPONENT 1 (INPUT1), COMPONENT 2 (INPUT2), HDMI (INPUT4), and DVI (INPUT5), respectively. Also, SHIFT L1, SHIFT L2, and SHIFT L3, is set to VIDEO 1 (INPUT1), VIDEO 2 (INPUT2), and TV. With RemoteMaster application, you can change the key assignment to anything. I hope someone will find this useful.
HP LCxx00N Discrete Codes.zip 0.58203125k . file