I have talked to our devteam and this idea is marked as "improvement" which means it will be implemented in near future.
If you would like to have it faster, you might hire any advanced frontend/javascript developer to implement the change. Currently you are using mootools for this module, and the change sholud be done in:
modules/mod_grid_gk5/scripts/engine.mootools.js
file.
If you could change engine to jquery I might consider doing this customisation as payed one, but to do it as a free support change - its reaches outside of our standard technical forum support.