I suggest mapping the 1234 keys (plus mouse wheel) to directly edit each entproperty. Like this (use ctrl to increase 10 units instead of 1, and also to move faster):

editbind LCTRL [ multiplier = 10 ; gamespeed 500 ; onrelease [ multiplier = 1 ; gamespeed 100 ] ]
multiplier = 1

editbind 1 [ domodifier 10 ]
editbind 2 [ domodifier 11 ]
editbind 3 [ domodifier 12 ]
editbind 4 [ domodifier 13 ]
delta_edit_10 = [ entproperty 0 (* $arg1 $multiplier) ]
delta_edit_11 = [ entproperty 1 (* $arg1 $multiplier) ]
delta_edit_12 = [ entproperty 2 (* $arg1 $multiplier) ]
delta_edit_13 = [ entproperty 3 (* $arg1 $multiplier) ]

Oh, I forgot that passthrough binding!

And I've bound both "super-speed" and multiplier to same key because both actions are "boost", and are mutually-exclusive in practice (I guess you won't ever doing both at same time).

Thanks for changing your script. :)