as standard the turbo is quiet sedate and smooth, so there isnt a point at which you suddenly get a turbo boost.
Hmm, dunno about that, mine is standard and if I floor it it does seem to kick in a bit once I get to about 2200rpm, then again a bit harder at about 3500rpm. I figured the first kick was the turbo waking up and the second was the engine hitting its' natural power-band.
As for the clutch, yes I found it pretty stiff to start with but I got used to it quickly. My previous car (and first one so no laughing!) was a Fiat Punto, with a very light clutch. Having driven my LCR225 for a couple of weeks now I don't struggle with the clutch as much as I did at first.