Is it possible to load sexy topo data? If so what requirements are there on format etc? I tried one file but CRP didn' recognize it.

Never used Sexytopo. However looking into the import format available into CRP, I see Sexytopo (*.txt). If this doesn't work maybe there is a bug that Jochen could fix.
Otherwise, CRP can import Therion *.th files. And I'm sure Sexytopo exports survey to *.th format (you might find *th2 file but these are not survey data files).