I might be retarded.

Use the Mix parameter in the chorus effect edit page to control the dry/wet ratio.
For the delaytime it depends on the type of delay you are using.
Turn the Type knob when you are in the delay edit screen to select between tap, free and analog delay.
The first one allows you to dial in the delaytimes using musical values based on number of 16th notes. Free and analog use standard milliseconds.

Have you noticed some of the effects have multiple pages of parameters? If not, that is why you aren't finding some of them.

For setting a specific bpm you must go to Rig settings. (Rig button)

Use the < and > buttons to navigate through all possible parameters for an FX.

Helpful hint: If the < or > button is lit yellow, you can scroll in that direction.

Then save them and name them so they are available to add to any rig you want.