Hi, glad to hear you’re enjoying the H90!
There is no global setting for Tempo Mode to always be off, but we may be able to add something like that to a future update.
If you are building a Program from scratch, you can start with an INIT Program which is made out of 2 Thru Presets. If you replace either of those Presets, then certain Algorithm’s Presets will have Tempo Mode on, while others won’t.
For example, the “Band Delay” preset has Tempo Mode on, while “Guitars In Space” has Tempo Mode off.
You could save some custom default Presets with Tempo Mode off for some of the Algorithms you are using most frequently and that may improve the workflow for you.