Mostly using native Reaper actions, with a few of standard OSC commands (play, cycle, stop, etc.)...
I present v1 of ReaperRemote, a TouchOSC layout.
Native Reaper Actions:
-Delete, Undo, Redo
-Duplicate, Split (at play position), Glue
-Freeze/Un-Freeze, Render (Pre-fader) Stereo/Mono
-Cut, Copy, Paste
-Select All/None Items/Selected Items Time
-1 - 10 Hotkeys for Reaper Screensets
-Start/End of project
-Forward/Reverse Measure or Beat
-Media/FX browsers, Routing/Grouping Matricies, Mixer, Selected Item Midi Editor, and Settings Hotkeys
Oh yeah, Position in Beats, Tempo +/- and display, Loop toggle, Play, Stop, Record buttons.
{invalid file? can't upload *.touchosc?}
So the TouchOSC file with the layout is below.
https://drive.google.com/file/d/0B46...ew?usp=sharing
(screenshots from a RCA 7" tablet and KX Studio running Reaper)