I know you said you want to use Strobe.

It is a good tool, in some situations.
Quite a few years ago, it had some issues and I decided to drop it.

My two primary teams are melee.
In one case, all five toons are in melee (Feral Druids) and in the other I have a healer and four melee (Pally & 4x F.DK's).

I make extensive use of IWT, and usually spam that like crazy.
I've actually imbedded it, into my DPS spam keys, so it is automatically pressed (and very often) just by doing my DPS.
But I can toggle that off, as it is a Mapped Key, which can be enabled/disabled (in IS Boxer) with a Key Map Action > Mapped Key State Action.

Anyway...
Usually I spam my IWT.
And the melee toons (they're the target of my IWT spam), circle about the target like crazy.
I have my Follow macro bound to a mouse thumb button.
In chaotic/hectic PvP, when I notice they've moved far away, I will target (and thus IWT) a closer target.
You can even use a killed and lootable corpse as the target, for your IWT to bring the team in closer.
I also have slave only movement keys, and frequently use Down Arrow to break the movement.

It isn't automatic like Strobe can be.
But with those tools, it is very workable.
- Enable/Disable the auto IWT, as desired.
- Manual, not automatic IWT with a hotkey.
- IWT a corpse or close target to bring the melee closer to the Healer.
- A movement hot key, to stop the toons from running off.
- A very easy to access Follow hotkey.

Use whatever approach works best for you.
I'm just throwing another option onto the table for your consideration.