Holding down Ctrl + mouseclick on a cell only makes sense to me if the developer tried to copy the MS Excel behavior.
But here a grid has a definded selection mode: single or not.
And i don´t understand why a user has to hold down a key just to add or remove a cells from selection?
In multiselection mode clicking on a cell should toggle its selection state. C´est ca.
In single-mode it clears all selections and then selects the cell clicked on.
Ever forgot holding down 'Ctrl' on the very last cell after 5 minutes of selecting cells? Then you know what i´m talking about....