S5 Tempo Map: Global edit possible?

We have a MIDI arrangement whose starting tempo is 94 bpm. The tempo map of this song has several line drawn tempo changes which represent ritards and accelerandos....

The client wants to hear it in 90 bpm and 98 bpm also. Is there a way to enter the new tempos and let the ritards and accelerandos adjust to follow the new tempo settings.

We searched the manual and it seems that we will have to redraw all the tempo changes again....or maybe there is a way to globally edit the tempo map?

Thanks.

Vic