Hello!
The looping issue will be included in a release as soon as we're done. It is currently impossible to say when, but we are working on it.
Regarding HAP, it is a very nice codec, since most of the work is done in the GPU relieving the CPU of the burden of uncompressing video in real time. We support all three flavours of HAP (HapStandard, HapAlpha and HapQ). HapStandard and HapAlpha have the same quality, the only exception being the alpha channel. HapQ takes more space than HapStandard, but is quite a lot better in reproducing colors. There is no way to get alpha with HapQ, meaning that is you want alpha you will have to live with slightly lower quality.
/Erik