Tempos in Scheduler
Each item in your Scheduler library can be assigned either a fixed or changing tempo, which can form part of your scheduling rules.
Rather than a fixed list, you can choose which tempos can be applied to your library items. This can be done either as part of the initial setup process or from your library's Settings page.

When you create your tempos, you can re-order them to put them in order of fastest to slowest. This will be reflected when you use tempo-based rules and to order the Tempo drop-down list anywhere it appears in your library.

If you set an item as having a changing tempo, when you have the tempo flow rule enabled, it will ensure items are scheduled alongside tracks with a similar tempo to avoid any jarring transitions.