From your description, it sounds as if you're using AMS Designer as the simulator (probably wise to actually say that, to avoid guesswork on the part of anyone who wants to try to help you). In which case the version of spectre is not relevant, because it's just using the simulator from the INCISIV92 stream.
Anyway, the Tcl analog command only allows you to change iabstol, reltol and vabstol (and the analog stop time). There is no Tcl command to change errpreset (which is dominated by the three above anyway) or method. You could probably use the save/restart options to stop the simulation at a particular point, change the analog control file (hence changing the errpreset or method) and then restart with that. Need to take a little care in case you introduce a step at that point.