just got this mouse today.. well its part of the mx5000 combo... i switched from the mx700 duo, but heres my questions.. the middle button (scroller) ..when i had my mxduo it would open a new tab in firefox, however the mx1000 is not doing this.. is there a setting i need to change? cuz this was a super important feature to me and even in cs:S when i had the pushdown set to "jump" it doesnt work w/ the mx1000 so has neone figured this out?? help!.. also i notice there is lag w/ this mouse if u start moving it really fast is there a setting i should change.. i read on neowin alot of people experience lag issues and others expereicne no issues what should i do?!