UPDATE FROM MABULA
I have had a very rough 2 months unfortunately health wise. I was struck 3x in a row with bacterial infections. The second infection occurred  after a routine hospital checkup and I became very sick. I had to rest and take a lot of antibiotics. Once I was recovering and restarting work 1 month ago, I again became sick. The infection was not yet gone, so even more antibiotics and rest was needed. Needless to say, it took a lot of my energy and I needed a lot of rest.
Finally, the infection is really gone and my energy is coming back step-by-step now and I have started work again. I am terribly sorry to have kept you waiting for support. I will address all outstanding questions and e-mails step-by step and will be on the forum daily from today.
APP 2.0.0-beta47 will come soon as well, a lot of work was already completed before I became very ill, so the release is also nearly ready for you. Beta47 will be much faster actually. Many workflows will be more than 2x faster, mosaics can even be 10x faster than before because registration really received a major boost... all compared to beta46. Â Before I release it, I will make sure that everything is working properly and then I will release it.
In https://www.astropixelprocessor.com/community/postid/26970/ I described how my Vaonis Vespera makes a mosaic by progressively generating something like a spiral of frames, where there is usually significant overlap between adjacent frames.
Currently the only way to stack these with APP is to go through an incredibly expensive pair-wise star matching process for every possible pair of frames.
I'd like to suggest an alternate mode, where APP first just tries to match against the last "X" frames. If a match is not found, try matching against "Y" previous frames chosen at random.  If a match is still not found, add the frame to a queue to be checked later against the whole mosaic accumulated thus far.
I will pass this on to Mabula and ask if that would make sense for his algorithm.
Hi Ray @raybellis,
We are planning to rewrite our mosaic algorithms. Once done, your data should work well and fast then in mosaic mode 😉 We will move away from the current naive method of finding all connections of all frames to the other frames.
Mabula