Remove timer on positive EXP booster cards

I would like to be able to save my exp boosters for when im able to use them or only let the timer expire when youre on the game not over night . in battlefield 4 and WOT youre able to save a bunch up to use when ever you feel like it ( only allowed 1 at a time ). Seeing them expire is painful especially the 100% boosters and would like to have a stockpile of boosters when a new item is added or a event that needs exp to use them on.

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