A lot of people complain about the UVMAPPING tool in Lightwave so your not alone
there.
You can use LIGHTWAVE 32bit for modelling, most people do I think.. I could be wrong due to the handy plugins you have access too. well I do
.. If I rendered I would use the 64bit to make use of all the PC abilities..
People some time model in 32 but render in 64.. you should have access to both