I’d sure as hell like it, I am seriously hoping this doesn’t get moved to beginners questiions and it’s actually really easy lmao.
But yeah, truthfully. I’d like to either know how or get it in an update 
You can automate BPM, LPB and TPL via pattern commands:
http://tutorials.renoise.com/wiki/Pattern_Effect_Commands#Global_Commands
And in Renoise 2.8 you can now automate these values with graphical envelopes on the Master track: (Only works on the Master)
3359 