If your Main need is to save steps to printing either landscape or portrait create a couple of presets.
One for portrait and one for landscape.
You can set each one up with the printer properties you need and then just use the preset for the layout you need.
Go to the Snagit "Manage Presets" or open the capture window
Click on the Image tab and then in the "share" field select "Printer" then click on the little gear and configure your printer settings. Make any other capture settings you want such as the capture selection type and if the capture goes to the Editor first for markup before you print.
Note: If you do send the capture to the editor first then you just need to click the big green button when you want to print and off it will go to the printer.
If you want the capture to go straight off to the printer turn OFF the "Preview in Editor" option.
Once you have all your settings set for the preset click on the Plus (+) sign and select "New preset from current settings.
Give the preset a name and set a hotkey if you want one.