regard long stroke the pen on beatmap as clicking mouse button 2

[MeerukYang]

using tablet and pen is unable to act as mouse button 2. like if i want to check a beatmap's detail then i have to drop my pen and grab my mouse; this is terrible.

i mean when stroke the pen on one beatmap like this:

when release the pen it should be like this:

btw, i had set my tablet drive to let the button on the pen to be clicked as right mouse button, but it just didn't work in game; in fact it still act like left mouse button.