I dunno, it works for me in Paint, but Google found me
this article about touch,
http://www.marauderzstuff.com/PermaLink,guid,e9be3dd6-f2fa-4b18-98c5-0741c4212aed.aspx
which includes a description of the "touch pointer"
which is a built-in on-screen mouse that you control
by touch, and I guess that programs think you're just
using a mouse. So, that may be a work-around for you,
or, other information in the article may be useful.