I dunno if it's fair to fix to 125...... My personal example : my computer sux a lot & I usualy play with 76. On OACL, it is forced to 125, so I have only 109/110... And it's disturbing me. 125 must to be only the maximum limit.
125 Hz physics are enforced server-side so even if you change your FPS, it won't affect the physics (how high you jump).
So what the game does it to give you the most possible FPS at anytime.
But if you want to get a stable FPS, you can change that like in any other game, by enabling the vertical sync :
- r_swapInterval 1 or 2 or 3 etc...
This will force your graphic card to be the most stable possible (it will round up to each big value automatically, you don't have to take care particularly of the number of FPS, here it's useless).
This is the way all games do to get a stable fps (this is logical : vertical synchronisation), com_maxfps is specific to OA and Q3.