yes this is possible with autohotkey. For example, you can make autohotkey send ctrl alt shift in 3ds max by just pressing tab. so tab-A would send ctrl alt shift A to 3ds max.
You can hack the TAB key directly into the *.kbdx config file, using tab's virtual key code ( being "0x09" ). Together with the Max internal action provided to toggle floating windows, you are able to simulate the sub-window toggling using the tab key, like Adobe does it in Photoshop for example For Max 2013 and up: simply…