Parenthesis matching should work simply by double-clicking on the parenthesis. The matching should also be customizable and not limited to only matching parenthesis.
For instance, I should be able to customize GWD so that I can match "Begin" with "End".

Another way that I find works well in ConTEXT is simply to put the cursor next to a (, {, [, etc. The editor highlights this brace and its matching partner. This has the advantage that you don't actually have to double click, etc to match the braces. Could this be done in GWD?