In my experience, we have been able to undertake full intensity lifting earlier than full speed running. These lifts include cleans, snatches, squats, lunges, etc. I am a bit more careful with RDL’s, hypers and lifts of this type - but they are never doing maximal lifts with these types of movements anyways. My feeling is that the hamstring will generally recover strength rather quickly - assuming the appropriate steps have been taken in Week 1. High velocity running, however, places more unique and complex demands on the hamstring including rapid stretching, contraction, relaxation and co-contraction, within a window of a few tenths of a second. Hence, the predominance of acceleration work in rehab - with all other training elements following from the results during these sessions.
In terms of ordering activities and adjust volumes, obviously upper body work takes on an increased role - with bench press providing the main stimulus. This may be the case for 7-10 days. Squatting may be introduced rather early - but we will start with a low to moderate low and squat to a fixed depth (i.e. bench squat). Much of the lower body work depends on the feedback I’m getting from the athlete. “Does it feel stiff, does it feel weak?” In some cases we can introduced muscle cleans or muscle snatches early, and then get into short range cleans or snatches from the hip to minimize tension on the hamstring. Pretty soon we are back to Olympic lifts from the floor.
I’m not a fan of any loaded knee flexion work (i.e. ham curls, glute ham raises) for sprinters or anyone who wants to run fast beyond 10 meters. Anecdotally, any athletes who I witnessed spending a lot of time on these types of exercises tended to have more problems with hamstring strains than those who didn’t. And, knee flexion in sprinting is a low load (or no load) function. Leg recovery is the result of the foot folding up under the body following hip extension.
For athletes who are not pure sprinters (football, soccer, basketball), I also incorporate some co-contraction work into the rehab program (i.e. deceleration, direction change, cutting, etc) to strengthen the hamstring in that regard.