I think it's important to remember, the current issues with the Humax HDR are not only down to the firmware but part of a bigger implementation which is being finalised.
The issues with the timers/recordings are expensive to diagnose until there are more implementations of boxes on the market and the problem can be isolated to a specific issue either with the box firmware, or the freesat spec (it might be a design flaw in the spec), or the freesat epg data. The Freesat EPG data has been live barely a year, (remember how long it took the Freeview 7 Day EPG data to stabilise, and that's much simpler).
It makes sense that Humax are focusing on new features at this stage to add value to the box given the above. Unfortunately, new features take time and are difficult to put a timescale to, especially if you're the first company to implement it (eg iPlayer). It's easier for competitors, Humax will have already solved the big problems for them.
It's going to be a couple of years before the HDR starts working flawlessly, you have to accept that as an early adopter. Try for a refund if you're not satisfied, but don't think that these issues are falling on deaf ears, I imagine Humax will be working around the clock right now to make the HDR the gold standard in Freesat boxes.