I have the utmost respect for you and know how long you've been struggling with issues with media indexing etc. However, the example you show (via Twitter) doesn't seem like a justified reason at all.
This person shouldn't be complaining when an unofficial device can not see an app that the device was never certified to get/have access to. We certainly demand a lot from HP (and previously Palm) but we definitely can't demand devs to make our unofficial devices work perfectly, and in turn, HP to make our unofficial devices to access/work with everything perfectly. Its a users own choice to upgrade to an OS version that isn't supported for their device.
Now the real underlying problem is why Palm/HP gave up on 2.x on older devices in the first place. That's a valid complaint.
Hope you don't take it the wrong way, but I just think your response to that should be, I'm sorry I've done all I can to request it, but neither I nor HP can fully support your Meta-Doctored device...