[OpenLayers-Dev] constant tile grid for tiled mapserver layer

[BrainDrain]

Is it possible to override some OL code to get constant tile extents ('grid'
for tiled mapserver layer) 
independently of map bounds. I need one grid for all zoom levels to support
server-side caching by url (currently extent is too variable part).
initGriddedTiles function in Grid.js uses calculateGridLayout which returns
tileoffsetlat, tileoffsetlon, tileoffsetx, tileoffsety different for certain
bounds (zoom level, +zoom can be fractional).
Any help will be appreciated!
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