Very simple design, no frills. To use it, just click and drag the bar to the desired FPS.

Current: V.1.2 - Added Reset button

local cF = 0
local cX = 60
function fpsbar()
tpt.drawrect(4,354,200,12,255,255,255,255)
tpt.fillrect(205,354,tpt.textwidth("Reset") + 5,12,255,255,255,255)
tpt.drawtext(208,357,"Reset",0,0,0,255)
tpt.fillrect(5,355,cX,10,255,255,255,255)
tpt.drawtext(4,346,"Target FPS: " .. cX .. ", Current FPS: " .. math.floor(cFPS),255,255,255,150)
tpt.setfpscap(cX)
end
function mTest()
if tpt.mousex >= 10 and tpt.mousex <= 204 and tpt.mousey >= 355 and tpt.mousey <= 375 then
cX = tpt.mousex - 4
elseif tpt.mousex >= 205 and tpt.mousex <= 205 + tpt.textwidth("Reset") + 5 and tpt.mousey >= 354 and tpt.mousey <= 366 then
cX = 60
end
end
function currentFPS()
f=os.clock()
cFPS=1/(f-cF)
cF=f
tpt.fillrect(5, 355,cFPS,10,0,155,0,155)
end
tpt.register_mouseclick(mTest)
tpt.register_step(fpsbar)
tpt.register_step(currentFPS)

OK, so you built one too. Yours is a bit fancier, but mine works just as well.

BTW: @Hittox: Thanks! I might try to do that - I've been working on making it toggle anyways.