No there is no time bank unfortunately and there is no way to add a 2.5x button on the software as far as I am aware, maybe there is some hotkey program that would allow you to, but I would not be the best person to advise on that
Ah I'll just type it manually then. And actually there is a timebank, I found it today while playing For anyone out there who is not seeing it, timebank is at the top of the table, above the Total Pot thingy