the reduce brush can be improved. At full strength it barely subtracts polygons.The smoothing function also does not seem to subtract much from the count, though complexity of the visible surface is clearly lost.
You are WELL on your way to a commercial product ! Have only had 2 crashes in at least 9 sessions, model was always recoverable.
The reduce brush is tied to the size of the brush vs the density of the surface its being used on. So make the brush smaller or zoom in more when you use it and turn up the strength. and smooth does not remove geometry, it simply relaxes the mesh surface.
Also, saying you'll contribute if X feature is added or Y feature is modified is rude. If you have suggestions please leave them in the suggestions thread in the support sub-forum.
Please do not consider donations as funding for future development. I will most likely take some more time to fix problems and improve various aspects, but I do not view this as my career. You can't "buy more features" (though I won't stop you from trying).