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The scrolling key row is awesome.  Another idea may be to do like most of the remote PC connection apps (team viewer, iTeleport, et cetera) where there is an entire custom keyboard for arrows, home, end, macro keys, and so on.  A lot of keys wouldn't be needed in Textastic like the F keys, Alt, Ctrl, windows, and the apple keys, but could be useful for the afore mentioned keys.  Just a thought. 
Yes, custom keys and cursor keys would be fantastic. Ability to configure the additional keys for multiple keystrokes like != := <% %> <? /> etc. would be helpfull too. If custom isn't an option, coldfusion should have the # key added. Love this app!