I believe currently a workaround is needed to set a speedmaster to a specific bpm value via commandline.
Assuming you have upgraded to the newly released v1.2, this could be a plausible solution:
1: Paste the following into commandline or create a macro, and execute once
Lua "for i=0,240 do SetVar(GlobalVars(),'bpm'..i,math.sqrt(i/240)*100) end"
2: Use the following syntax whenever you need to set a bpm-value:
Master 3.1 At $bpm95
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If you want to remove the variables that maps bpm to percentage values,
paste the following into commandline or create a macro, and execute once
Lua "for i=0,240 do DelVar(GlobalVars(),'bpm'..i) end"