I wouldn't call them mushy, but if one wanted to eliminate the pedal take up, you could weld .050 to .100 " to the end of the rod that actuates the master cyl. just be careful not to make it too long because fluid expansion from heat is the reason there is a gap between the parts anyhow. no gap = rubbing brakes at all times when it gets hot.

old vw bug tricks, I'd have to admit. the rod on veedubs is adjustable btw. of course you can adjust the brakes on those, but 4 wheel discs aren't gonna do anything adjustment wise.

in all likely hood, lengthening the rod would fail as I think maybe the bypass pressure and slop is built into the master cyl.