As I read it, it appears as though you are saying that QR is not available in the BiteSMS Beta 8.0.8 build? I don't use the other SMS applications so I can't speak for them.
BiteSMS was just updated at the beginning of the week to support up iOS 7 w/ ARM64 support (iPhone5s). With that being said there are still a few buggy things and features which still aren't fully working (themes, etc) but the QR and QC functions are working.
I found my way to this blog because I was able to hook up Activator with BiteSMS and I found a bug in activator and I'm trying to see if other people are having the issue or its just me.
The bug I think is in activator in that the "double tap on the status bar" action only works when use two different fingers to tap the status bar. If you switch the action to "single tap the status bar" then it works as expected.
Activator 1.8.3
BiteSMS Beta 8.0.8 (BiteSMS beta repo:
http://test-cydia.bitesms.com) <--- Support iPhone5s
Let me know if you have the same bug?