Guys
Aweful bugs in mouse modifiers
if default item left drag modifiers is set to "select time"
The left drag do not act correctly (happened at random)
the action seemed to be the one set in the region lan context
Just tested with another modifiers (shoft+alt) -> same result
On the other hand, if I set default modifieirs "item bottom" to "toggle selection" left click on bottom of item make this ->