I don't recall if it exists but it would be nice if one could turn off the auto channel updating as that may be a cause.
Good news, my Philips remote accessed all of the menu functions. The buttons I lost were AUDIO and ZOOM (shucks but can still be toggled in the menu). The CC button is inactive but that function works under SLEEP (weird). I get the FAV with the OK button. I recall there was a fancier model too that controlled more devices; this one only controls a TV, VCR OR DVD, and CBL (you can program whatever you want into all but the TV button). Also has some nifty punch-through programmable modes (I P-T TV volume/mute while in VCR mode). Anyhow, based on this I suspect there are plent of remotes you can use in the event you lose your Zinwell remote.
My info lists 1211, 1414, 0599 (A), and 0699 (B) for a Philips DVD-Recorder and 0738 (A), 0036 (B), 0136 (C), and 0763 for a Philips DVR. They say to use the A, B, etc. if you have 2 or more of the same device.