Is there a way to level up only once when I have XP for more than one level-up?

A level-up only happens when you choose which stat to increase. Otherwise, you stay the same level. However, if more than one level-up is buffered, when you go to stat-up, you must level-up all at once. Is there a way to stat-up only as many times as one wishes and save buffered levelling for later? Being able to do so would allow training on levels-that-are-before-the-level-you're-supposed-to-be.