Keyboard selection modifiers??

I should probably know this by now, but are there keyboard selection modifiers to pull out specific types of unit from a selection area?

I know SHIFT gets both combat and fabber units, but is there a modifier for just land or just air?
I'll often box select a group of units then spend valuable time removing a class of unit from the group.

I've looked in the settings and there are view/planet wide selection options, but nothing listed for modifying a box selection..
If this doesn't exist, is it something people may be interested in?

Afaik hotbuild2 has some limited support for this. If hotbuild is configured to build dox with E and grenadiers with R, then you can select a group of dox and grenadiers and click E and you will have only dox selected. I think you can also shift+E to exclude dox from the selection.

Edit: to answer your question: no, i don't think it is in, and yes, i want it too!

holy ****, really? I gotta try this!

This is one aspect I'd really like to see in PA, more control over selections. Picking out orbital units is fiddly, and just generally getting what you want can be a chore.

Tried it, works. Only works within one unit category of course, so I still hope this gets some attention from Uber. Thanks man!

Hey, no worries I'd also like to see it implemented.