Since today’s Hotfix patch, the following macro no longer uses the Flexweave Underlay if the first two actions are not performed.
#showtooltip Disengage
/cast Wing Clip
/cast Disengage
/use 15
It will only use the Underlay if you are in melee range, cast wing clip and disengage. At range, it will Disengage, no Underlay. Not in combat and falling to your death, no Underlay.
Thank you,
Edit: This has been listed in other topics, my apologies.