Importance calculations are a strange thing. They are based just on the extremes of utilities for attributes. Increasing the price importance from 30% to 50% may or may not result in an increase in price sensitivity of the market (as viewed in the simulator) by 5/3.
Manipulating the price importance is not a new topic. Pinnell (https://www.sawtoothsoftware.com/downloadPDF.php?file=multstge.pdf
) and Williams/Kilroy (https://www.sawtoothsoftware.com/downloadPDF.php?file=priceaca.pdf
) both describe approaches for post hoc adjusting the importance of price after the data have been collected. It involves multiplying the price part worths by a constant (either per individual as in Pinnell or per segments of respondents as in Williams/Kilroy).
So, it is indeed quite possible to open your utility file and multiply the price part worths by a given constant (different per respondent) to increase the importance of certain attributes from 30% to 50%.
Whether you should do this or not is a good debate...but it is indeed quite possible.