Can I make keyboard modifiers stay on?

I am sure I am saying this wrong, sorry about that. What I need to do is to make keyboard modifiers used by windows programs permanent until I turn them off (Win 7 ultimate x64). For example, in one GIS program I use Alt-Shift-right mouse click quite often to select objects in many layers in a drawing. When I just use the mouse button I select objects in one layer only. So if I want to repeatedly select objects in multiple layers I have to hold down Alt-Shift when I am using the mouse, which is a royal pain in  the arse.

Sometimes I select some objects using the modifier, then click on another window in the program, click the mouse over a cell in a table, type some stuff in (in this window Alt-Shift has no effect on the mouse behavior), then back to the drawing to select something else, and NOT have to use Alt-Shift (but I want the mouse to function in the same manner). I want to use Alt-Shift-right click once, then turn off the key combination and just use the mouse to select until I press it again.  

I don't think this is possible in native Win but there may be software out there that does this?
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johnb6767Connect With a Mentor Commented:
If this is an Application Specific hotkey, I think the answer is no, as a 3rd party app wouldn't be able to do the same functions that your app's hotkeys..... Id leave it open for more discussion though.... Maybe someone will have some thoughts....
orerockonAuthor Commented:
Thanks guys, I found a 3rd party app that works, evaluating it now!
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