Is it possible to use actions (stop, fork etc.) to break up individual tasks (login, load next page) within a recorded scenario for the purpose of measuring the time taken for each? I have to record the login and then any subsequent tasks for each scenario. This means I can't see how long the individual tasks took to complete. Thanks.
I do not understand your issue. If during the recording you create a NeoLoad transaction for each of your business transaction like login you will get that response time.
The use of the logical actions won't help you to measure that.