change fps in GUI, move by numbers

README.md

@@ -11,14 +11,21 @@ example:  `tsmark video.mp4 --ts 10,00:01:23.4`
 ## Keyboard shortcuts:
 
 ```
-Arrows left and right, Home, End
-          jump in video. Tap frequently to increase time step
+(Note: after mouse click, arrows stop working due to unknown bug: use j,l,i,k)
+Arrows, PgUp, PgDn, Home, End or click mouse in position bar
+j l i k [ ]
+          jump in video position
+0-9       move to 0%,10%,20% .. position
 , and .   move one frame at a time
 z and c   move to previous or next mark
-x         mark frame
-space     pause
-i         toggle HUD
-q         quit
+x or double click in the video
+          mark frame
+space or click video
+          pause
+f         toggle 0.5x 1x or 2x FPS
+v         toggle HUD
+h         toggle help
+q or esc  quit
 ```