Option to run Slingshot without triangular pointer in upper left

I would like to have a startup option to launch Slingshot without the triangular pointer near the upper left corner. When I launch Slingshot from Plank the triangular pointer is misleading.

The logic behind launching Slingshot from Plank is less mental overhead and less physical work. I don't have to journey to another spot on my screen to open an app if I can't see it in the dock. To launch any app, I look at the dock. If I see the app, I can click on it. If I don't see the app, I click on the Slingshot icon in the dock.

When I open Slingshot from the dock, Slingshot's triangular pointer is directing my attention to a place on the screen that I don't need or want to put my attention on. If I could add a -smooth option to the Exec line in the Slingshot.desktop file that I made, that would solve the problem.

My Slingshot.desktop file looks like this:

[Desktop Entry]
Version=1.0
Type=Application
Name=Slingshot
Comment=
Exec=slingshot-launcher
Icon=plank
Path=
Terminal=false
StartupNotify=false

I store it in ~/.local/share/applications/

To get Slingshot to show up in Plank, terminate and restart slingshot-launcher.