Using jscript to change timer setting

When using feedback for a driver (specifically Helvar), is it now possible to use jscript to change the timer setting ?

I'd like to reduce the timer when a page is shown, so that values update quickly. then increase the timer setting when the page isnt loaded. I need to do this as I cant have 300 channels being updated every few seconds.

Is this now possible in v3 pro ? I seem to remember that it was going to be done, but havent seen anything in the release docs about it being included