Hi Clement --
Yes you can edit Audio Maps from QLab Remote, on both iPad and iPhone. Once you're connected to your workspace, tap the Gear menu in the upper-left corner and select "Edit Audio Maps". You can drag marks, filters, and map objects, and you can optionally enable heatmaps.
There also is an Audio Map Monitor to view the positions of current map objects.
QLab Remote does not currently have a fade path editor however, so to edit Fade cues and their object paths you'll need to edit on the primary Mac or from another Mac connected to your primary workspace using Collaboration.
Brent