VJair... did you read my [edit3] from the post above?
I guess you should be able to use this option... It is a bit of searching in the xml file, but it's all there. (my advise is to start with this on a new composition with one clip on each layer as a starter! (mapped to an exclusive/unique key, in my case numpad 5, which is easy to recognize inside the xml file)
Save that compo/keymap and then start editing the xml file.
I just copied a block with the -in my case numpad 5- key, and pasted that 5 times, and then, in the pasted blocks, changed the "5" to 6, 7, 8 and 9, etc.. .. I guess you get it right now
Once finished, save the xml, and restart Avenue.
Now, when you try to clear the keymap on that specific clip (try it!!) you see that it's stacked with as many keys as you pasted in the xml file... in my case I had to clear it 5 times to get rid of the 5 keys mapped to that one clip!!
Once you edited the clip-trigger keys in the .xml file, the cuepoints can be "learned" from the mapping menu inside Avenue.
I hope you can understand my explaination... it's a bit of a workaround ofcourse...
I know it's not the most perfect solution, but in the end it will work i guess.
On second thought.. with my first solution (one possible cuepoint per clip) you also should be able to only load 1 clip.. but load that one clip several times, on several positions, with DIFFERENT cuepoints.. in the end, you can use the same file over and over again and just change the cuepoint on clip level for every clip

So you don't have to cut and make all different clips for all the cuepoints you want.