in DOS original, they maybe rise 0.1 % or less, unless you stand on them
in openxcom, they may rise 70%, i didnt have many tentaculats in the missions yet, but i think they rise up too, so was this part modded?
Not that I know of. It may be that you remember wrong, I definitely recall camping downed Sectoids and Chryssalids thirty years ago. Or perhaps you're using different weapons now.
Standing on the body has never made any difference, short of blocking that spot and making them stand up on another tile.
You
should be able to shoot them on the ground if there are no nearby walls, or just blast the area with a stun bomb or similar. Some mods allow you to keep fallen foes down via smoke grenades, not sure this extends to the original.
i am not sure of this one in the control menu, if "alien bleeding" was said to YES, then would this stop the rising behaviors?
Maybe a few of them, but not in general. They'd need to bleed
to death faster than they recover from stun for that to work, and for that to happen, you'd need to either wound them so badly they might as well be dead anyway, or use a wound-centric weapon (which aren't in vanilla). Or stun them so hard the issues is moot anyway.
are the number of alien colonies limited by any chance in the geoscape in openxcom? i used to have around 30 colonies all over the globe in the original DOS version before MC labs, now in OpenXCOM, all i have is maybe 6 visible alien colonies...
I'd suggest it's a matter of random mission generation. There's a lot of randomness in what you can get, so one playthrough does not necessarily resemble another. You might lose all your major sponsors to infiltration, but see just a few bases. Or there may be a million bases, but very little abduction or infiltration. Vanilla does tend to converge towards having a spread of all mission types, but nothing is ever guaranteed with RNG.
And you may, of course, be missing the other 24+ colonies that are there, chilling under your radar.
the xcom unit's movement in the control menu was set to max, but still, time wasting for moving 10 units per turn are repetitively slow and bad in my head
They always moved about as fast as they do now, just the game itself was accelerated if your CPU could handle it.
The best tip I have is to make the trajectory appear off-screen, even if the destination isn't. Then movement is near-instantanaous. You can also Shift-click to make your soldiers cease stopping when they see an alien, if you already know where the alien is and don't care about that individual soldier's vision of them.
there seems to be NO hotkeys for move upward and downward when they wear the mag ion armors, i use these commands the most
I know no hotkey for this, either, but using the scroll wheel to change height and regular movement isn't too bad.