Follow Through Time? Casting Time? Both of those add time to the casting of the spell. It will still interrupt orders though - there's no avoiding that.
Do you mean something like how do you make it so that you can cast a channeling spell without having to channel through it but still make the ability happen? Well that's simple ^_^ all you have to do is to create 2 of the same spell. One that's not channeling and one that is, then make the hero have the non-channeling one and give the channeling spell to a dummy unit. Then trigger it so that when your hero casts the spell, it will create a dummy unit at your position that will cast the channeling spell for you.
Here's a sample trigger
Trigger:
Stampede Non Channeling
Events
Unit - A unit Starts the effect of an ability
Conditions
(Ability being cast) Equal to Stampede (The NON-Channeling Spell)
Actions
Set Stampede_Point[1] = (Position of (Triggering unit))
Set Stampede_Point[2] = (Target point of ability being cast)
Unit - Create 1 Dummy for (Owner of (Triggering unit)) at Stampede_Point[1] facing (Facing of (Triggering unit)) degrees
Unit - Add Stampede DUMMY to (Last created unit) (The Channeling Spell)
Unit - Order (Last created unit) to Neutral Beastmaster - Stampede Stampede_Point[2]
Unit - Add a 10.00 second Generic expiration timer to (Last created unit)
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory