I think the following uses are not expected as normal. However, it is
out of my curiosity, and from my hideous bugs hunting experiences:

   3 (+&2.1) 5
11.3

It seems like, in this case, +&m is y+m*x.

What about the following?

   1 9 (i.&2) 1 2
1 1
   1 9 (i.&3) 1 2
2 1
   1 9 (i.&1) 1 2
0 0
   1 9 (i.&0) 1 2
2 1

Is there a general rule for dyadic use of bonded verbs?
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