The odesolve routine in Prime is supposed to find the best method for the problem. However, that doesn't always work, as demonstrated in the following thread: http://communities.ptc.com/message/242208#242208. My guess is that it is almost impossible to anticipate every type of error that would lead to a change in the method selected, therefore, we need the capability of selecting the method for odesolve manually, as in Mathcad 15.
We need an argument in the odesolve call that specifies the method. I would prefer it to be a string variable with the name of the method. That would be better documentation for others than a number, which is meaningless to most readers. I also think having the method shown explicitly, rather than selected by right clicking, provides more complete documentation.
We should be able to specify the method for minerr and find also.
Currently, some of the ODE methods don't work with units. Those methods need to be updated to allow units so that odesolve can use any method without changing the problem definition.