Please ignore this if already exits, but I couldn't find it tho, please let me know otherwise.
Would be cool to have a capture mode so when the cursor goes out of the object, it can still sets its values, basically the cursor controls the object until raised, just like this:
I do use heavy use of matrix objects and I am really missing this feature, you can see here editing values stop working once I leave the object.
Turns out it's much more complicated than I thought. For the time being I'd recommend using a canvas widget, the multislider example behaves as described by @abcd, you'd need to adjust it to your needs of course.
Thanks jean-emmanuel! I see, I've made a quick modification with some stuff I gonna need and this works perfectly, so I can use it meanwhile. I have to install the latest update now you added the canvas_update(), that's cool. Thanks once more again!