Speedbrake questions

Two questions regarding the Speedbrake :1. I'm using a Pedestal with a Speed Brake lever defined as an axis and whenever touching this, the NG lever wildly moves up and down. This doesn't happen with other planes, so are there any ideas what could cause this ?Also I have not completely figured out the Speedbrake logic when using the "/"-key or at least I can't really correlate this with the Speedbrake operation described in the FCOM. Could anyone shine a light on this ?2. I once forgot to retract the speed brake, so it was in flight detend position in landing configuration. Should not happen, I know, shame on me, but there is no indication in the panel. On the right side of the real panel there is a "Speedbrake extended" indication, which would light up additionally in landing configuration or below 800 AGL.Since the "Speedbrake do not arm" indicator below the "Speedbrake armed" indicator is not used (at least I have never noticed it), wouldn't it make sense to move the above mentioned "extended" indication to the left side ? A PMDG special option, so to speak.I know, not as real as it gets, but maybe a reasonable compromise ?Mike