I had a piece I did recently that starts in 5/4 and then half way through changes to 4/4 time. The only solution was to record some basic rhythm tracks in 4/4 time in GarageBand, export it and then import into Cubasis and place on beat 1 of the first bar after the 5/4 section. Then added the rest of the instrumentation. Turned out fine.
But I agree, time change and tempo change over time is very much needed. Especially tempo change to give a more natural human feel to sequenced tracks.